Full opinion text
Judge RAGGI concurs in part in a separate opinion. Judge DEARIE dissents in part in a separate opinion. REENA RAGGI, Circuit Judge: I. Background...............................................................132 A. 2001: The Initial FBI Investigation into Co-Defendant Tank Shah..........132 B. 2001: Shah Offers to Support al Qaeda....................................132 C. 2005: Shah and Sabir Swear Allegiance to al Qaeda and Attempt To Provide Material Support.............................................133 D. Prosecution and Conviction.............................................133 II. Discussion................................................................134 A. 18 U.S.C. § 2339B Is Not Unconstitutionally Vague as Applied to Sabir’s Case................................................................134 1. The Statutory Framework...........................................134 2. Sabir’s Vagueness Claim.............................................136 a. Sabir Fails to Demonstrate Facial Vagueness or Overbreadth.........136 b. Sabir Fails To Demonstrate that § 2339B Is Unconstitutionally Vague as Applied to his Case...................................138 (1) Sabir’s Vagueness Claim Is Properly Reviewed as Applied........138 (2) The Standards for As-Applied Review..........................139 (3) Sabir’s Vagueness Challenge to the Statutory Proscriptions Fails.....................................................140 (4) The “Medicine” Exception Does Not Render § 2339B Unconstitutionally Vague as Applied to Sabir..................142 B. The Trial Evidence Was Sufficient To Support Sabir’s Conviction............144 1. Count One: Conspiracy..............................................144 2. Count Two: Attempt................................................145 a. Intent.........................................................145 b. Substantial Step................................................146 (1) The “Substantial Step” Requirement Expands Attempt Beyond the Common Law...................................146 (2) Identifying a Substantial Step by Reference to the Crime Being Attempted..........................................147 (3) The Evidence Manifests a Substantial Step Towards the Provision of Material Support in the Form of Personnel.....148 (4) The Dissent’s Mistaken View of the Substantial Step Requirement..............................................149 (a) Sabir Did More Than Express a Radical Idea When He Produced Himself as a Doctor Sworn To Work Under the Direction of al Qaeda................................149 (b) The Provision of Personnel and the Subsequent Provision of Expert Services by Such Personnel Are Distinct Forms of Material Support..............................150 (c) Upholding Sabir’s Attempt Conviction Raises No Double Jeopardy Concerns.....................................153 (d) No Government Conduct Precluded a Jury Finding of a Substantial Step .......................................153 C. The District Court Reasonably Rejected Sabir’s Batson Challenge............154 1. Prospective Juror #5...............................................156 2. Prospective Juror #26..............................................156 3. Prospective Juror #27..............................................157 D. Sabir’s Evidentiary Challenges Are Uniformly Without Merit...............158 1. Expert Witness Testimony...........................................158 a. Kohlmann’s Testimony Satisfied the Enumerated Requirements of Rule 702...................................................158 b. Kohlmann’s Testimony Was Helpful to the Jury.....................159 c. Kohlmann’s Testimony Was Relevant'..............................159 d. Kohlmann’s Testimony Did Not Reach Beyond the Government’s Rule 16 Proffer...............................................160 2. Co-Conspirator Statements..........................................160 a. Shah’s Recorded Conversations with the Informant and the Undercover Were Admissible Under Fed.R.Evid. 801(d)(2)(E).....160 b. The Admission of Shah’s Statements Did Not Violate Sabir’s Right to Confrontation.........................................162 3. Prior Inconsistent Statement.........................................163 4. State-of-Mind Evidence.............................................164 5. Rule 403 Objections.................................................164 a. The Shareef Materials...........................................165 b. The Poughkeepsie Mosque Incident...............................165 c. Mujahideen Activities in Bosnia...................................165 E. Summation Issues .....................................................166 F. Juror Misconduct......................................................168 III. Conclusion 170 Defendant Rafiq Sabir, whose birth name is Rene Wright, is a United States citizen and licensed physician who, in May 2005, swore an oath of allegiance to al Qaeda and promised to be on call to treat wounded members of that terrorist organization in Saudi Arabia. Convicted after a jury trial in the United States District Court for the Southern District of New York (Loretta A. Preska, Chief Judge) of conspiring to provide and actually providing or attempting to provide material support to a terrorist organization in violation of 18 U.S.C. § 2339B, and sentenced to a 300-month term of incarceration, Sabir now challenges his conviction on various grounds. Specifically, he contends that (1) § 2339B is unconstitutionally vague and overbroad, (2) the trial evidence was insufficient to support his conviction, (3) the prosecution’s peremptory jury challenges exhibited racial bias, (4) evidentiary rulings deprived him of the right of confrontation and/or a fair trial, (5) the district court abused its discretion in addressing alleged juror misconduct, and (6) the prosecution’s rebuttal summation deprived him of a fair trial. For the reasons explained in this opinion, we conclude that these arguments lack merit. Accordingly, we affirm Sabir’s judgment of conviction. I. Background, A. 2001: The Initial FBI Investigation into Co-Defendant Tank Shah Defendant Rafiq Sabir is a New York licensed physician, trained at Columbia University, who specializes in emergency medicine. In 2001, the Federal Bureau of Investigation began investigating Sabir’s longtime friend Tarik Shah for the possible transfer of money to insurgents in Afghanistan. As part of that investigation, an FBI confidential informant known as “Saeed” cultivated a relationship with Shah, in the course of which Shah was recorded speaking openly about his commitment to jihad (holy war) in order to establish Sharia (Islamic law) and about his wish to provide “deadly and dangerous” martial arts training to mujahideen (jihad warriors). Gov’t Exh. (“GX”) 802T at 1-2; GX 803T at 2-4; GX 804T at 3; Trial Tr. at 590-91, 601-03. During these conversations, Shah repeatedly identified Sabir as his “partner.” GX 801T at 1; GX 807T at 3; see Trial Tr. at 903-04. B. 200j: Shah Offers to Support al Qaeda On March 3, 2004, Saeed and Shah traveled to Plattsburgh, New York, where Saeed introduced Shah to Ali Soufan, an undercover FBI agent posing as a recruiter for al Qaeda. In a series of recorded meetings with Agent Soufan, Shah detailed his martial arts expertise and offered to travel abroad to train al Qaeda combatants. Shah also told Soufan about Sabir, “an emergency room doctor” who had been his “trusted friend[]” for more than 25 years. GX 902T at 2, 7. Explaining that he knew Sabir’s “heart,” Shah proposed that the two men join al Qaeda as “a pair, me and a doctor.” Id. at 3, 23. At a subsequent meeting with Saeed, Shah reported that he had spoken in person with Sabir about this plan. Shah and Agent Soufan next met in Orlando, Florida, in April 2004, at which time Shah agreed to prepare a syllabus for a martial arts training course as well as a training video. Shah also questioned Soufan at this meeting about al Qaeda suicide bombings and asked whether he could receive, as well as provide, terrorist training. C. 2005: Shah and Sabir Swear Allegiance to al Qaeda and Attempt To Provide Material Support For most of the time between May 2004 and May 2005, Sabir was out of the United States, working at a Saudi military hospital in Riyadh. On May 20, 2005, during a visit to New York, Sabir met with Saeed and Agent Soufan at Shah’s Bronx apartment. Sabir told Soufan that he would soon be returning to Riyadh. He expressed interest in meeting with mujahideen operating in Saudi Arabia and agreed to provide medical assistance to any who were wounded. See GX 906T at 15, 87. He suggested that he was ideally situated to provide such assistance because he would have a car in Riyadh and “carte blanche” to move freely about the city. Id. at 67. To ensure that Shah and Sabir were, in fact, knowingly proffering support for terrorism, Soufan stated that the purpose of “our war, ... our jihad ” is to “[ejxpel the infidels from the Arabian peninsula,” id. at 22, and he repeatedly identified “Sheikh Osama” (in context a clear reference to Osama bin Laden) as the leader of that effort, see, e.g., id. at 31, 34, 59, 87, 98-99. Shah quickly agreed to the need for war to “[ejxpel the Jews and the Christians from the Arabian Peninsula,” id. at 22, while Sabir observed that those fighting such a war were “striving in the way of Allah” and “most deserving” of his help, id. at 66. To permit mujahideen needing medical assistance to contact him in Riyadh, Sabir provided Soufan with his personal and work telephone numbers. See id. at 40, 83. When Shah and Soufan noted that writing down this contact information might create a security risk, Sabir encoded the numbers using a code provided by Soufan. See id. at 49-53. Sabir and Shah then participated in bayat, a ritual in which each swore an oath of allegiance to al Qaeda, promising to serve as a “soldier of Islam” and to protect “brothers on the path of Jihad ” and “the path of al Qaeda.” Id. at 106-08, 114-16. The men further swore obedience to “the guardians of the pledge,” whom Soufan expressly identified as “Sheikh Osama,” i.e., Osama bin Laden, and his second in command, “Doctor Ayman Zawahiri.” Id. at 98,108-10,115. D. Prosecution and Conviction Shah and Sabir were arrested on May 28, 2005, and thereafter indicted in the Southern District of New York on charges that between October 2003 and May 2005, they (1) conspired to provide material support or resources to the terrorist organization al Qaeda, see 18 U.S.C. § 2339B; and (2) provided or attempted to provide such support, see id. §§ 2339B, 2. See Indictment ¶¶ 1-2, United States v. Shah, S4 05 Cr. 673(LAP) (S.D.N.Y. filed June 27, 2005). The two counts used identical language to describe three types of material support that defendants provided, attempted to provide, or conspired to provide: (i) one or more individuals (including themselves) to work under al Qaeda’s direction and control and to organize, manage, supervise, and otherwise direct the operation of al Qaeda, (ii) instruction and teaching designed to impart a special skill to further the illegal objectives of al Qaeda, and (iii) advice and assistance derived from scientific, technical and other specialized knowledge to further the illegal objectives of al Qaeda. Id. ¶¶ 1-2. The two counts further alleged that Shah would provide “martial arts training and instruction for jihadists,” while Sabir would provide “medical support to wounded jihadists,” both defendants “knowing that al Qaeda had engaged and engages in terrorist activity” and “terrorism.” Id. After Shah pleaded guilty on April 4, 2007, to Count One of the indictment, trial against Sabir commenced on April 24. On May 21, 2007, the jury found Sabir guilty on both the conspiratorial and substantive charges against him, and, on November 28, 2007, the district court sentenced him principally to 300 months’ incarceration. This appeal followed. II. Discussion A. 18 U.S.C. § 2339B Is Not Unconstitutionally Vague as Applied to Sabir’s Case In raising a constitutional challenge to his conviction, Sabir relies on the same argument he urged in the district court in unsuccessfully seeking dismissal of his indictment: that 18 U.S.C. § 2339B is void for vagueness and overbroad in defining the conduct proscribed. See United States v. Shah, 474 F.Supp.2d 492, 496-500 (S.D.N.Y.2007). Upon de novo review, see Arriaga v. Mukasey, 521 F.3d 219, 222 (2d Cir.2008), we conclude that the argument is without merit as § 2339B presents no overbreadth concerns and is not unconstitutionally vague as applied to Sabir’s conduct. 1. The Statutory Framework Preliminary to explaining our reasons for rejecting Sabir’s vagueness challenge, we review the relevant statutory framework. Title 18 U.S.C. § 2339B(a)(l) imposes criminal liability on anyone who “knowingly provides material support or resources to a foreign terrorist organization, or attempts or conspires to do so.” The statute expressly conditions liability on a person having knowledge that the relevant organization is a “designated terrorist organization” or “has engaged or engages in terrorist activity” or “terrorism” consistent with various specified provisions of law. 18 U.S.C. § 2339B(a)(1); see Holder v. Humanitarian Law Project, - U.S. -, 130 S.Ct. 2705, 2709, 177 L.Ed.2d 355 (2010) (holding that “knowledge about the organization’s connection to terrorism, not specific intent to further the organization’s terrorist activities,” is mental state required to prove violation of § 2339B). In identifying the “material support or resources” whose provision to a designated terrorist organization is proscribed, § 2339B references the definition of that term “in section 2339A (including the definitions of ‘training’ and ‘expert advice or assistance’ in that section).” Id. § 2339B(g)(4). Section 2339A states, in pertinent part: (1) the term “material support or resources” means any property, tangible or intangible, or service, including currency or monetary instruments or financial securities, financial services, lodging, training, expert advice or assistance, safehouses, false documentation or identification, communications equipment, facilities, weapons, lethal substances, explosives, personnel (1 or more individuals who may be or include oneself), and transportation, except medicine or religious materials; (2) the term “training” means instruction or teaching designed to impart a specific skill, as opposed to general knowledge; and (3) the term “expert advice or assistance” means advice or assistance derived from scientific, technical or other specialized knowledge. Id. § 2339A(b). With respect to the provision of “personnel,” § 2339B limits liability to persons who have “knowingly provided, attempted to provide, or conspired to provide a foreign terrorist organization with 1 or more individuals (who may be or include himself) to work under that terrorist organization’s direction or control or to organize, manage, supervise, or otherwise direct the operation of that organization.” Id. § 2339B(h). The statute states that “[i]ndividuals who act entirely independently of the foreign terrorist organization to advance its goals or objectives shall not be considered to be working under the foreign terrorist organization’s direction and control.” Id.; see Holder v. Humanitarian Law Project, 130 S.Ct. at 2728 (emphasizing that statute “avoid[s] any restriction on independent advocacy, or indeed any activities not directed to, coordinated with, or controlled by foreign terrorist groups”). 2. Sabir’s Vagueness Claim For a conviction to comport with the constitutional mandate of due process, see U.S. Const, amend. V, the penal statute at issue must define the criminal offense (1) “with sufficient definiteness that ordinary people can understand what conduct is prohibited” and (2) “in a manner that does not encourage arbitrary and discriminatory enforcement.” Kolender v. Lawson, 461 U.S. 352, 357, 103 S.Ct. 1855, 75 L.Ed.2d 903 (1983); accord Holder v. Humanitarian Law Project, 130 S.Ct. at 2718; United States v. Rybicki, 354 F.3d 124, 129 (2d Cir.2003) (en banc). Sabir argues that his conviction violates both prongs of this void-for-vagueness doctrine because § 2339B’s prohibitions against providing “personnel,” “training,” and “expert advice and assistance” to terrorist organizations are overbroad and afford insufficient notice to persons who may traduce those prohibitions and inadequate standards for authorities who must enforce them. He contends further that the statutory exception for “medicine” is too vague to have put him on notice that it did not encompass his consultative services as a physician. a. Sabir Fails to Demonstrate Facial Vagueness or Overbreadth Sabir contends that § 2339B is unconstitutionally vague both on its face and as applied to his case. In support of his facial challenge, Sabir relies primarily on the overbreadth doctrine. This confuses the issue. As the Supreme Court recently observed, vagueness and overbreadth are distinct concerns, the first implicating the Due Process Clause and the latter the First Amendment. See Holder v. Humanitarian Law Project, 130 S.Ct. at 2719. A statute whose application is clear is not rendered unconstitutionally vague because it proscribes expression protected by the First Amendment. Id. In any event, Sabir fails to state an overbreadth claim. A law is unconstitutionally over-broad if it “punishes a substantial amount of protected free speech, judged in relation to [its] plainly legitimate sweep.” Virginia v. Hicks, 539 U.S. 113, 118-19, 123 S.Ct. 2191, 156 L.Ed.2d 148 (2003) (internal quotation marks omitted). A finding of overbreadth invalidates all enforcement of a challenged law, unless it can be saved by a limiting construction. Id. at 119, 123 S.Ct. 2191. Mindful that such relief is “strong medicine,” the law rigorously enforces the burden on the challenging party to demonstrate “substantial ” infringement of speech. United States v. Williams, 553 U.S. 285, 292, 128 S.Ct. 1830, 170 L.Ed.2d 650 (2008) (emphasis in original). Sabir’s recitation of the applicable legal standards and his conclusory declaration that § 2339B is overbroad do not come close to carrying this burden. As the Supreme Court stated in rejecting a First Amendment challenge to § 2339B, the statute leaves persons free to “say anything they wish on any topic,” including terrorism. Holder v. Humanitarian Law Project, 130 S.Ct. at 2722-23. It does not prohibit independent advocacy of any kind. See id. at 2723, 2728. It does not prohibit or punish mere membership in or association with terrorist organizations. See id. at 2723, 2730. Thus, it does not seek to suppress ideas or opinions in the form of ‘pure political speech.’ Rather, [it] prohibits] ‘material support,’ which most often does not take the form of speech at all. And when it does, the statute is carefully drawn to cover only a narrow category of speech to, under the direction of, or in coordination with foreign groups that the speaker knows to be terrorist organizations. Id. at 2723. Such circumstances do not evidence overbreadth. To the extent Sabir asserts that § 2339B is overbroad in limiting “a doctor’s right to practice medicine,” Appellant’s Br. at 14-15, he cites no authority locating such a right within the Constitution, much less in the First Amendment. The Supreme Court has long held that “there is no right to practice medicine which is not subordinate to the police power of the states ... and also to the power of Congress to make laws necessary and proper” to the exercise of its constitutional authority. Lambert v. Yellowley, 272 U.S. 581, 596, 47 S.Ct. 210, 71 L.Ed. 422 (1926) (Brandeis, J.) (rejecting physician’s claim that, despite powers conferred on Congress by Eighteenth Amendment, he held constitutional right to prescribe such medicines as he deemed best to effect patient’s cure); see also Conn v. Gabbert, 526 U.S. 286, 291-92, 119 S.Ct. 1292, 143 L.Ed.2d 399 (1999) (observing that there is no due process right to practice one’s profession free of any restraints and that due process is violated only by “complete prohibition of the right to engage in a calling”); Dent v. West Virginia, 129 U.S. 114, 122, 9 S.Ct. 231, 32 L.Ed. 623 (1889) (“[Tjhere is no arbitrary deprivation of [the right to practice medicine] where its exercise is not permitted because of a failure to comply with conditions imposed by the state for the protection of society.”). With particular reference to the First Amendment, a plurality of the Court in Planned Parenthood of Southeastern Pennsylvania v. Casey, 505 U.S. 833, 112 S.Ct. 2791, 120 L.Ed.2d 674 (1992), rejected a First Amendment challenge to a state law requiring physicians to provide patients with specific information about certain medical risks, observing that “[t]o be sure, the physicians’ First Amendment rights not to speak are implicated, ... but only as part of the practice of medicine, subject to reasonable licensing and regulation by the State,” id. at 884, 112 S.Ct. 2791 (plurality opinion). Because Sabir thus cannot claim a “right” to provide medical treatment for terrorists that is not “subordinate to ... the power of Congress to make laws necessary and proper” to the nation’s defense, Lambert v. Yellowley, 272 U.S. at 596, 47 S.Ct. 210; see U.S. Const. art. I, § 8, he cannot mount a claim that § 2339B is unconstitutionally overbroad. Nor can Sabir demonstrate overbreadth by faulting § 2339B for not requiring proof of his “specific intent to further ... terrorist activities.” Appellant’s Br. at 24; see Holder v. Humanitarian Law Project, 130 S.Ct. at 2718 (construing § 2339B not to require proof of such intent). The argument is grounded not in the First Amendment but in the Fifth, specifically, in the due process requirement that any conviction be supported by evidence of personal guilt. See Scales v. United States, 367 U.S. 203, 224-25, 81 S.Ct. 1469, 6 L.Ed.2d 782 (1961). Such a due process concern can arise when criminal liability is premised on mere membership in an organization. See id. at 205-06, 224-28, 81 S.Ct. 1469 (rejecting Fifth Amendment challenge to Smith Act, 18 U.S.C. § 2385 (prohibiting membership in organization advocating overthrow of United States government by force or violence), because conviction required proof of knowing and active membership in organization and intent to contribute to success of specifically illegal activities). No such concern arises with respect to § 2339B, however, because, as we have already observed, that statute does not prohibit simple membership in a terrorist organization. Rather, the statute prohibits the knowing provision of material support to a known terrorist organization. Proof of such provision (whether actual, attempted, or conspiratorial) together with the dual knowledge elements of the statute is sufficient to satisfy the personal guilt requirement of due process. In sum, Sabir fails to state a claim— much less demonstrate — that § 2339B is either facially vague in violation of due process or overbroad in violation of the First Amendment. b. Sabir Fails To Demonstrate that § 2339B Is Unconstitutionally Vague as Applied to his Case (1) Sabir’s Vagueness Claim Is Properly Reviewed as Applied In the absence of First Amendment concerns, courts generally view vagueness challenges to a statute as applied to the defendant’s case. See Chapman v. United States, 500 U.S. 453, 467, 111 S.Ct. 1919, 114 L.Ed.2d 524 (1991) (“First Amendment freedoms are not infringed by [the statute at issue], so the vagueness claim must be evaluated as the statute is applied.”); accord United States v. Williams, 553 U.S. at 304, 128 S.Ct. 1830; United States v. Rybicki, 354 F.3d at 129-30 (collecting cases). This preference for as-applied review is “ ‘[e]mbedded in the traditional rules governing constitutional adjudication,’ ” notably, in “ ‘the principle that a person to whom a statute may constitutionally be applied will not be heard to challenge that statute on the ground that it may conceivably be applied unconstitutionally to others, in other situations not before the Court.’ ” Parker v. Levy, 417 U.S. 733, 759, 94 S.Ct. 2547, 41 L.Ed.2d 439 (1974) (quoting Broadrick v. Oklahoma, 413 U.S. 601, 610, 93 S.Ct. 2908, 37 L.Ed.2d 830 (1973)). That principle, grounded in the separation of powers, serves the jurisprudential maxim that “as between two possible interpretations of a statute, by one of which it would be unconstitutional and by the other valid,” a court’s “plain duty is to adopt that which will save the Act” enacted by Congress. Blodgett v. Holden, 275 U.S. 142, 148, 48 S.Ct. 105, 72 L.Ed. 206 (1927) (Holmes, J.); see Rust v. Sullivan, 500 U.S. 173, 190, 111 S.Ct. 1759, 114 L.Ed.2d 233 (1991) (noting courts’ “categorical” duty to seek “every reasonable construction ... to save a statute from unconstitutionality” (emphasis in original; internal quotation marks omitted)). To the extent the Supreme Court has suggested that a facial challenge may be maintained against a statute that does not reach conduct protected by the First Amendment, the identified test is, in fact, only a variation on as-applied analysis, requiring the defendant to show “that the law is impermissibly vague in all of its applications.” Village of Hoffman Estates v. Flipside Hoffman Estates, Inc., 455 U.S. 489, 497, 102 S.Ct. 1186, 71 L.Ed.2d 362 (1982); accord United States v. Salerno, 481 U.S. 739, 745, 107 S.Ct. 2095, 95 L.Ed.2d 697 (1987) (observing that defendant mounting facial challenge bears heavy burden because he “must establish that no set of circumstances exists under which the Act would be valid”). In practice, the Hoffman Estates/Salemo rule warrants hypothetical analysis of “all applications” only in cases of pre-enforcement facial vagueness challenges. See, e.g., Richmond Boro Gun Club, Inc. v. City of New York, 97 F.3d 681, 684-86 (2d Cir.1996). Where, as here, a defendant has already been convicted for specific conduct under the challenged law, Hoffman Estates itself instructs a court confronting a facial challenge to “examine the complainant’s conduct before analyzing other hypothetical applications.” Village of Hoffman Estates v. Flipside Hoffman Estates, Inc., 455 U.S. at 495, 102 S.Ct. 1186. Accordingly, our review of Sabir’s vagueness challenge focuses on the application of § 2339B to the facts of his case. (2) The Standards for As-Applied Review On as-applied review of the “notice” requirement of due process, courts ask whether the challenged “statute, as written, provides notice sufficient to alert ‘ordinary people [as to] what conduct is prohibited.’ ” Arriaga v. Mukasey, 521 F.3d at 224 (quoting Kolender v. Lawson, 461 U.S. at 357, 103 S.Ct. 1855). This test does not demand “ ‘meticulous specificity’ ” in the identification of proscribed conduct. Id. (quoting Grayned v. City of Rockford, 408 U.S. 104, 110, 92 S.Ct. 2294, 33 L.Ed.2d 222 (1972) (noting that such standard would come at cost of “flexibility and reasonable breadth” (internal quotation marks omitted))). Rather, it requires only that the statutory language “ ‘conveys sufficiently definite warning as to the proscribed conduct when measured by common understanding and practices.’ ” Id. (quoting Jordan v. DeGeorge, 341 U.S. 223, 231-32, 71 S.Ct. 703, 95 L.Ed. 886 (1951)). Similarly, with respect to the due process concern of arbitrary enforcement, a statute certainly will not be deemed unconstitutionally vague if “‘as a general matter,’ ” it “ ‘provides sufficiently clear standards to eliminate’ ” such a risk. Id. (quoting Farrell v. Burke, 449 F.3d 470, 494 (2d Cir.2006)). But even “ ‘in the absence of such standards,’ ” a statute will survive an as-applied vagueness challenge if " ‘the conduct at issue falls within the core of the statute’s prohibition, so that the enforcement before the court was not the result of the unfettered latitude that law enforcement officers and factfinders might have in other, hypothetical applications of the statute.’ ” Id. (quoting Farrell v. Burke, 449 F.3d at 494). Applying these principles to this case, we identify no unconstitutional vagueness in § 2339B as applied to Sabir’s case. (3) Sabir’s Vagueness Challenge to the Statutory Proscriptions Fails Sabir contends that the statutory terms at issue — “training,” “personnel,” and “expert assistance and advice” — are inherently too vague to provide the notice and direction required by due process. Such a general complaint is now foreclosed by Holder v. Humanitarian Law Project. The Supreme Court there observed that these terms did not require the sort of “untethered, subjective judgments” that had compelled it to strike down statutes tying criminal culpability to vague concepts such as “annoying” or “indecent” conduct. 130 S.Ct. at 2720. The Court identified further protection against vagueness in Congress’s addition of “narrowing definitions” for these terms, which “increased the[ir] clarity,” as well as in the knowledge element required for a § 2339B conviction. Id. Sabir’s more specific challenges to the application of these terms to the particular facts of his case are equally meritless. To the extent Sabir was convicted of conspiring with Shah to provide “training” — i.e., “instruction or teaching designed to impart a specific skill, as opposed to general knowledge,” 18 U.S.C. § 2339A(b)(2) — to a known terrorist organization, a person of “ordinary intelligence,” Grayned v. City of Rockford, 408 U.S. at 108, 92 S.Ct. 2294, would require nothing more than “common understanding,” Jordan v. De George, 341 U.S. at 232, 71 S.Ct. 703, to recognize that this prohibition plainly encompassed “martial arts training and instruction for jihadists” serving al Qaeda, Indictment ¶¶ 1-2. In Holder v. Humanitarian Law Project, the Supreme Court held that “[a] person of ordinary intelligence would understand that instruction on resolving disputes through international law falls within the statute’s definition of ‘training’ because it imparts a ‘specific skill,’ not ‘general knowledge.’ ” 130 S.Ct. at 2720. That conclusion is even more apparent here, where the trial evidence showed that the martial arts training Shah proposed to provide was specific and deadly and hardly a matter of general knowledge. See, e.g., GX 814T at 3-4 (recording Shah’s explanation of how to kill a man by ripping out his throat). Moreover, al Qaeda’s history for using murderous terrorism in an attempt to intimidate civilian populations and governments, see 18 U.S.C. § 2331 (defining terrorism) — particularly American civilians and the United States government — is so well known that no reasonable person could doubt that training al Qaeda members in martial arts is precisely the sort of material support proscribed by § 2339B, see Arriaga v. Mukasey, 521 F.3d at 224; United States v. Rybicki, 354 F.3d at 129. We likewise reject Sabir’s vagueness challenge to the term “personnel” as applied to his ease. The provision of personnel is prohibited by § 2339B only when an individual knowingly provides, attempts to provide, or conspires to provide a foreign terrorist organization with one or more individuals, including himself, “to work under that terrorist organization’s direction or control or to organize, manage, supervise, or otherwise direct [its] operation.” 18 U.S.C. § 2339B(h). Quite apart from Shah’s offer to act as a martial arts trainer for al Qaeda in that organization’s pursuit of jihad, Sabir’s offer to serve as an on-call doctor for the organization, standing ready to treat wounded mujahideen in Saudi Arabia, falls squarely within the core of this prohibition, defeating any suggestion either that he lacked notice that his conduct was unlawful or that the statute was enforced arbitrarily with respect to him. See Farrell v. Burke, 449 F.3d at 494; United States v. Rybicki, 354 F.3d at 129. In an effort to avoid this conclusion, Sabir argues that his offer of life-saving medical treatment was simply consistent with his ethical obligations as a physician and not reflective of any provision of support for a terrorist organization. The record does not support this characterization. Sabir was not prosecuted for performing routine duties as a hospital emergency room physician, treating admitted persons who coincidentally happened to be al Qaeda members. Sabir was prosecuted for offering to work for al Qaeda as its on-call doctor, available to treat wounded mujahideen who could not be brought to a hospital precisely because they would likely have been arrested for terrorist activities. See GX 906T at 49, 69. In offering this support for al Qaeda, Sabir did not simply honor his Hippocratic oath. He swore a further oath of allegiance to al Qaeda, making clear that his treatment of wounded mujahideen would be provided not as an independent physician but as “one of the soldiers of Islam,” duty bound to obey al Qaeda’s leaders, including Osama bin Laden, and to protect his fellow “brothers on the path of Jihad ” and “on the path of al Qaeda.” Id. at 114-16. No reasonable person with a common understanding of al Qaeda’s murderous objectives could doubt that such material support fell squarely within the prohibitions of § 2339B. See Holder v. Humanitarian Law Project, 130 S.Ct. at 2721 (holding that statute limiting “personnel” to persons working under terrorist organization’s direction or control, rather than independently, adequately avoided vagueness). Nor is the statute’s prohibition on the provision of “expert assistance and advice” to terrorist organizations unconstitutionally vague as applied to Sabir. As the district court correctly observed, the medical expertise of a licensed physician plainly constitutes “scientific, technical or other specialized knowledge” under 18 U.S.C. § 2339A. See United States v. Shah, 474 F.Supp.2d at 497 n. 5. Indeed, such expertise requires more specialized knowledge than the instruction in relief application that the Supreme Court held “comfortably” to fall within the scope of “expert advice or assistance” in Holder v. Humanitarian Law Project, 130 S.Ct. at 2720. Any person of ordinary intelligence would readily recognize that such expert assistance (well outside the scope of one’s regular hospital duties), with the stated object of permitting al Qaeda fighters to advance “on the path of Jihad ” is exactly the sort of material support proscribed by § 2339B. See Arriaga v. Mukasey, 521 F.3d at 224; United States v. Rybicki, 354 F.3d at 129; cf. Watson v. Geren, 569 F.3d 115, 119, 134 (2d Cir.2009) (upholding conscientious objector claim of doctor who refused to serve in United States Army based on belief that treating wounded soldiers would be functional equivalent of weaponizing human beings). Further, because Sabir’s proffered support, whether viewed as training, personnel, or expert assistance, fell so squarely within the core of § 2339B’s prohibition, the application of that law to his conduct cannot have been the product of arbitrary law enforcement. See Farrell v. Burke, 449 F.3d at 494. (4) The “Medicine ” Exception Does Not Render § 2339B Unconstitutionally Vague as Applied to Sabir Sabir submits that, even if the training, personnel, and expert assistance provisions of the material support statute are not unconstitutionally vague as applied to his case, they are rendered so by vagueness in the statutory exemption of “medicine” from the definition of “material support.” 18 U.S.C. § 2339A(b)(l); see Oral Arg. Tr. at 33 (Jan. 17, 2007) (“How is a person of ordinary intelligence supposed to determine we are talking about medicine, only medicine, but not the provision of medical treatment by a doctor?”). The task of interpreting a statute necessarily begins with its language. See Bailey v. United States, 516 U.S. 137, 144, 116 S.Ct. 501, 133 L.Ed.2d 472 (1995); United States v. Awadallah, 349 F.3d 42, 51 (2d Cir.2003). Considered in isolation, the word “medicine” can convey various meanings, including both “a substance or preparation used in treating disease” and “the science and art of dealing with the maintenance of health and the prevention, alleviation, or cure of disease.” Webster’s 3d New Int’l Dictionary 1402 (2002); see also 9 Oxford English Dictionary 549 (2d ed. 1989) (defining “medicine” as both “[a]ny substance or preparation used in the treatment of disease” and “[t]hat department of knowledge and practice which is concerned with the cure, alleviation, and prevention of disease in human beings, and with the restoration and preservation of health”). But we do not look at statutory language in isolation to determine if it provides adequate notice of conduct proscribed or permitted. Rather, we consider language in context, see Bailey v. United States, 516 U.S. at 145, 116 S.Ct. 501; see also Robinson v. Shell Oil Co., 519 U.S. 337, 341, 117 S.Ct. 843, 136 L.Ed.2d 808 (1997), and, where appropriate, with the benefit of canons of statutory construction, see United States v. Dauray, 215 F.3d 257, 262 (2d Cir.2000), and legislative history, see Barenblatt v. United States, 360 U.S. 109, 117, 79 S.Ct. 1081, 3 L.Ed.2d 1115 (1959) (relying on “legislative gloss” to reject vagueness challenge to expansive construction of rule underlying conviction for contempt of Congress); United States v. Witkovich, 353 U.S. 194, 199, 77 S.Ct. 779, 1 L.Ed.2d 765 (1957) (observing that restrictive meaning of language may be indicated by, inter alia, “persuasive gloss of legislative history”); United States v. Harriss, 347 U.S. 612, 620, 74 S.Ct. 808, 98 L.Ed. 989 (1954) (relying in part on legislative history to construe statute to avoid vagueness challenge); United States v. Nadi, 996 F.2d 548, 550 (2d Cir.1993) (rejecting vagueness challenge where “common sense interpretation of [statutory language at issue] is confirmed by the statute’s legislative history”). The relevant context here starts with § 2339A(b)(l), which in cataloguing an expansive array of tangibles and intangibles that can constitute “material support or resources” notes two exceptions: “medicine or religious materials.” Relevant context also extends to § 2339B(a)(l), the provision making it a crime to “provide” material support. In the context of a statute focused on things that might be provided to support a terrorist organization, “medicine” is reasonably understood as a substance or preparation rather than as an art or science. “Providing medicine” is how common usage refers to the prescription of a substance or preparation to treat a patient. See, e.g., Grieveson v. Anderson, 538 F.3d 763, 774 (7th Cir.2008) (addressing challenge to practice that allegedly “provide[d] inmates with quantities of medicine” that could allow them to overdose); El Badrawi v. Dep’t of Homeland Sec., 258 F.R.D. 198, 202 (D.Conn. 2009) (addressing challenge to alleged failure to “provide” inmate with medicine); Celia W. Dugger, Nigeria: Help for Fighting Malaria, N.Y. Times, Oct. 24, 2009, at A8 (discussing organization’s announcement to “provide enough medicine for 56 million malaria treatments”); Gardiner Harris, Institute of Medicine Calls for Doctors to Stop Taking Gifts from Drug Makers, N.Y. Times, Apr. 29, 2009, at A17 (discussing recommendation that doctors stop giving free drug samples to patients “unless the patient was poor and the doctor could continue to provide the medicine for little or no cost”). By contrast, “practicing medicine” is how common usage describes Sabir’s proposed activity, i.e., employing the art or science of medicine to treat a patient. See, e.g., Smith v. Doe, 538 U.S. 84, 112, 123 S.Ct. 1140, 155 L.Ed.2d 164 (2003) (Stevens, J., dissenting and concurring in the judgment) (noting that incompetent doctor “may not be permitted to practice medicine”); Planned Parenthood of Se. Penn, v. Casey, 505 U.S. at 884 (plurality opinion) (noting “practice of medicine” was “subject to reasonable licensing and regulation”); Harris v. Mills, 572 F.3d 66, 68-69 (2d Cir.2009) (affirming dismissal of lawsuit arising from “revocation of [plaintiffs] license to practice medicine”). Where the word “provide” is used to describe the latter activity, reference ordinarily is made to “medical care,” or “medical treatment,” rather than to “medicine” alone. See, e.g., Frew ex rel. Frew v. Hawkins, 540 U.S. 431, 434, 124 S.Ct. 899, 157 L.Ed.2d 855 (2004) (noting requirement of Medicaid statute that state “provide various medical services to eligible children”); Washington v. Harper, 494 U.S. 210, 225-26, 110 S.Ct. 1028, 108 L.Ed.2d 178 (1990) (describing state’s interest with respect to mentally ill prison inmate “in providing him with medical treatment for his illness”). Moreover, Congress’s intent to have the medicine exception in § 2339A(b)(l) reach no further than substances or preparations that might be provided to a terrorist organization is stated with particular clarity in the statute’s legislative history. The House Conference Report accompanying the original legislation states that the word “ ‘[m]edicine’ should be understood to be limited to the medicine itself, and does not include the vast array of medical supplies.” H.R. Conf. Rep. 104-518, at 114 (1996), reprinted in 1996 U.S.C.C.A.N. 944, 947. In drawing this distinction between “the medicine itself’ and “medical supplies,” Congress served clear notice that the medicine exception does not reach “the outer limits of its definitional possibilities,” Dolan v. U.S. Postal Serv., 546 U.S. 481, 486, 126 S.Ct. 1252, 163 L.Ed.2d 1079 (2006), but is confined to medical substances and preparations. In short, context, common usage, and legislative history combine to serve on both individuals and law enforcement officers the notice required by due process that the medicine exception identified in § 2339A(b)(l) shields only those who provide substances qualifying as medicine to terrorist organizations. Other medical support, such as volunteering to serve as an on-call doctor for a terrorist organization, constitutes a provision of personnel and/or scientific assistance proscribed by law. See 18 U.S.C. §§ 2339A(b)(l), (3), 2339B(a)(l). Accordingly, we identify no merit in Sabir’s claim that § 2339B is unconstitutionally vague as applied to his case, and we decline to reverse his conviction as violative of the notice requirement of due process. B. The Trial Evidence Was Sufficient To Support Sabir’s Conviction Sabir contends that the evidence was insufficient to support his conviction. The rule of constitutional sufficiency, derived from the Due Process Clause, instructs that a conviction cannot be obtained “except upon proof beyond a reasonable doubt of every fact necessary to constitute the crime ... charged.” In re Winship, 397 U.S. 358, 364, 90 S.Ct. 1068, 25 L.Ed.2d 368 (1970); accord United States v. Aguilar, 585 F.3d 652, 656 (2d Cir.2009). A defendant raising a sufficiency challenge bears a heavy burden because a reviewing court must consider the totality of the evidence in the light most favorable to the prosecution and uphold the conviction if “any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt.” Jackson v. Virginia, 443 U.S. 307, 319, 99 S.Ct. 2781, 61 L.Ed.2d 560 (1979) (emphasis in original); accord United States v. Aguilar, 585 F.3d at 656. Applying these principles to Sabir’s case, we reject his sufficiency challenge as without merit. 1. Count One: Conspiracy In challenging his conviction for conspiracy to provide material support to a known terrorist organization, Sabir contends principally that the government failed to prove the existence of an agreement to violate § 2339B. We are not persuaded. To convict a defendant of conspiracy, the government must prove beyond a reasonable doubt “both the existence of the conspiracy alleged and the defendant’s membership in it.” United States v. Chavez, 549 F.3d 119, 125 (2d Cir.2008); see also id. (“The essence of any conspiracy is, of course, agreement, and in order to establish a conspiracy, the government must show that two or more persons entered into a joint enterprise with consciousness of its general nature and extent.”). The trial evidence in this case easily satisfied these elements. Testimonial evidence established that Shah and Sabir had long voiced interest in supporting jihad and mujahideen. See, e.g., Trial Tr. at 193-96 (reporting Shah preaching jihad and support for Osama bin Laden in late 1990s at Poughkeepsie mosque); id. at 287 (recounting Sabir’s 2003 conversation with mujahideen fighter inquiring how Sabir could help with jihad ). It is against this background that a jury would listen to the recorded conversation of March 4, 2004, in which Shah proposed to a federal undercover agent that Shah and Sabir — close friends for 25 years — join al Qaeda as “a pair, me and a doctor,” to support that organization’s pursuit of jihad. GX 902T at 23. More significantly, during the May 20, 2005 meeting at which Shah and Sabir formally swore allegiance and promised support to al Qaeda, Shah by providing al Qaeda members with martial arts training and Sabir by treating wounded al Qaeda members in Riyadh, see GX 906T at 106-16, Sabir acknowledged that he and Shah had talked “for a long time” about supporting jihad, id. at 110. Sabir plainly viewed his and Shah’s actions at the May 20 meeting as part of their common agreement. When Agent Soufan observed that neither man was obligated to support al Qaeda, Sabir responded that to fail to do so would be to “abandon[ ] my brother (Shah)” with respect to “the very thing we agreed upon ... in the first place.” Id. Accordingly, we identify no merit in Sabir’s sufficiency challenge to his conviction for conspiracy to provide material support to a known terrorist organization. 2. Count Two: Attempt Equally meritless is Sabir’s argument that the evidence was insufficient to support his conviction for attempting to provide material support to a known foreign terrorist organization. A conviction for attempt requires proof that a defendant (a) had the intent to commit the object crime and (b) engaged in conduct amounting to a substantial step towards its commission. See, e.g., United States v. Yousef, 327 F.3d 56, 134 (2d Cir.2003). a. Intent Sabir does not challenge the sufficiency of the evidence establishing his intent to provide material support to a foreign terrorist organization. Nor could he. In addition to Sabir’s statements already quoted in this opinion, see supra at [132, 140, 143-44], which constitute powerful evidence of the requisite intent, the following transcript excerpts from the May 20, 1995 meeting further support this element. After Sabir advised that his work in a Riyadh military hospital would put him in Saudi Arabia for two years, Agent Soufan stated that Sabir could help al Qaeda “[a]s a doctor ... as a Mujahid.” GX 906T at 19. Sabir not only signaled assent, he emphasized a need to “feel sure within myself that if I make a certain move, that move is going to be effective.” Id. To provide that assurance, Agent Soufan clarified how a doctor could be helpful to al Qaeda’s pursuit of jihad. He stated that Osama bin Laden himself had told Soufan that “we need doctors if they are trusted.” Id. at 32. Soufan explained that “brothers” sometimes get “hurt with a bullet” during “training” and in “operation[s].” Id. at 48-49. Because they cannot “go to a hospital,” the organization needs “doctor brothers ... to protect them ... [to] keep the other brothers healthy.” Id. at 49. Sabir readily agreed to provide that support, stating, “Let me give you another number,” whereupon he supplied his personal mobile telephone number, which, with Soufan’s assistance, he rendered into code. Id. at 48-50. Sabir understood that the purpose of the code was to conceal the fact that he was working for al Qaeda: Persons who learn the number “may not ... understand [its] significance.... They may not even recognize it as a telephone number.” Id. at 51. He also understood that the coded number would be provided to a trusted al Qaeda operative, who would identify himself as “Mus’ab” when contacting Sabir on behalf of a wounded jihadist. Sabir responded to this information, “God willing.” Id. at 87 (italics in transcript reflect translation from Arabic to English). Still later in the conversation, when Agent Soufan emphasized to Sabir that he could decline to treat mujahideen if he was not committed to al Qaeda’s goals, Sabir made plain that he had no reservations about using his medical expertise to support al Qaeda: “I will [do whatever I can do for the sake of God.... This is my job ... the best I can do is to benefit those people ... who are striving in the way of Allah---- [T]hese are the ones that are most deserving of the help.” Id. at 66. When Soufan further stated that it was difficult to take mujahideen to a hospital for treatment, Sabir emphasized that his military identification allowed him to travel freely around Saudi Arabia, thereby suggesting that he could go to the injured person. “[I]t’s almost like carte blanche.... It’s like you can go where you want to go with this.... And anybody that sees it, they don’t touch you.” Id. at 67. Later, Soufan sought to confirm this understanding, stating “[t]hat ID will be very good for you ... because you can definitely help mujahideen now,” to which Sabir responded, “Yes, yes.” Id. at 69. With evidence of his intent thus clearly established, Sabir focuses his sufficiency challenge on the “substantial step” element of attempt. b. Substantial Step (1) The “Substantial Step ” Requirement Expands Attempt Beyond the Common Law The “substantial step” requirement for attempt derives from the American Law Institute’s Model Penal Code, which in the early 1960s sought to “widen the ambit of attempt liability.” United States v. Ivic, 700 F.2d 51, 66 (2d Cir.1983) (Friendly, J.) (citing Model Penal Code § 5.01(l)(c) (Proposed Official Draft 1962)), overruled on other grounds by National Org. for Women, Inc. v. Scheidler, 510 U.S. 249, 254-55, 262, 114 S.Ct. 798, 127 L.Ed.2d 99 (1994). Previously, at common law, attempt had been limited to conduct close to the completion of the intended crime. See generally People v. Werblow, 241 N.Y. 55, 69, 148 N.E. 786, 789 (1925) (Cardozo, J.) (holding that, to constitute attempt, suspect’s conduct must “carry the project forward within dangerous proximity to the criminal end to be attained”); Commonwealth v. Peaslee, 177 Mass. 267, 272, 59 N.E. 55, 56 (1901) (Holmes, J.) (recognizing that “some preparations may amount to an attempt” when they come “very near to the accomplishment of the act”). By requiring proof only of a “substantial step” in furtherance of the intended crime, the Model Code ushered in a broader view of attempt. This court effectively adopted the Model Code’s formulation of attempt in United States v. Stallworth, 543 F.2d 1038, 1040-41 (2d Cir.1976). The Stallworth defendants were arrested when their planned armed robbery was “in progress” and “[a]ll that stood between [them] and success was a group of F.B.I. agents and police officers.” Id. at 1041. As such evidence would have demonstrated attempt even under the common law, the significance of the case rests not on its facts but on the court’s approving citation to the Model Code’s identification of a range of conduct — not always proximate to the desired criminal end — that might nevertheless constitute a substantial step when “strongly corroborative of the firmness of the defendant’s criminal intent.” Id. at 1040 & n. 5; see also id. at 1041 (observing that application of Model Code “emphasizes the importance of a rule [of attempt] encouraging early police intervention where a suspect is clearly bent on the commission of crime”). Accord United States v. Crowley, 318 F.3d 401, 408 (2d Cir.2003); United States v. Ivic, 700 F.2d at 66. Thus, a “substantial step” must be “something more than mere preparation, yet may be less than the last act necessary before the actual commission of the substantive crime.” United States v. Manley, 632 F.2d 978, 987 (2d Cir.1980). It is conduct “ ‘planned to culminate’ ” in the commission of the substantive crime being attempted. United States v. Ivic, 700 F.2d at 66 (quoting Model Penal Code § 5.01(e) (Proposed Official Draft 1962)). (2) Identifying a Substantial Step by Reference to the Crime Being Attempted While the parameters of the substantial step requirement are simply stated, they do not always provide bright lines for application. This is not surprising; the identification of a substantial step, like the identification of attempt itself, is necessarily a matter “ ‘of degree,’ ” United States v. Coplon, 185 F.2d 629, 633 (2d Cir.1950) (L. Hand, J.) (quoting Commonwealth v. Peaslee, 177 Mass, at 272, 59 N.E. at 56), that can vary depending on “ ‘the particular facts of each case’ ” viewed in light of the crime charged, United States v. Ivic, 700 F.2d at 66 (quoting United States v. Manley, 632 F.2d at 988); accord United States v. Crowley, 318 F.3d at 408. An act that may constitute a substantial step towards the commission of one crime may not constitute such a step with respect to a different crime. See generally United States v. Ivic, 700 F.2d at 66 (observing that substantial step requirement serves to ensure that person is convicted for attempt only when actions manifest “firm disposition” to commit charged crime). Thus, substantial-step analysis necessarily begins with a proper understanding of the crime being attempted. For example, in United States v. Delvecchio, 816 F.2d 859 (2d Cir.1987), a case frequently cited as illustrative of actions insufficient to demonstrate attempt, the substantive crime at issue was possession of a large quantity of heroin. We held that a substantial step to commit that crime was not established by proof that defendants had met with suppliers, agreed on terms, and provided their beeper numbers. Such evidence, at most, established a “verbal agreement,” which, “without more, is insufficient as a matter of law to support an attempted possession] conviction.” Id. at 862. In so concluding, we noted that what was missing was any act to effect possession, such as acquisition, or attempted acquisition, of the purchase money, or travel to the agreed-on purchase site. See id. The crime here at issue, however, is of a quite different sort. Sabir was charged with attempting to provide material support for terrorism. Whereas an attempt to possess focuses on a defendant’s efforts to acquire, an attempt to provide focuses on his efforts to supply, a distinction that necessarily informs an assessment of what conduct will manifest a substantial step towards the charged objective. Thus, while an agreement to purchase drugs from a supplier is not a substantial step sufficient to convict for attempted possession, see id. at 862, such an agreement to acquire might constitute a substantial step when the crime at issue is attempted distribution, see United States v. Rosa, 11 F.3d 315, 340 (2d Cir.1993) (holding evidence insufficient to prove attempted distribution where defendant “did not produce any heroin for the proposed sale ..., and there was no evidence that [he] ever entered into an agreement with a supplier or made inquiry of a supplier to obtain heroin for the proposed sale”). Further important to a substantial-step assessment is an understanding of the underlying conduct proscribed by the crime being attempted. The conduct here at issue, material support to a foreign terrorist organization, is different from drug trafficking and any number of activities (e.g., murder, robbery, fraud) that are criminally proscribed because they are inherently harmful. The material support statute criminalizes a range of conduct that may not be harmful in itself but that may assist, even indirectly, organizations committed to pursuing acts of devastating harm. Thus, as the Supreme Court recently observed, the very focus of the material support statute is “preventative” in that it “criminalizes not terrorist attacks themselves, but aid that makes the attacks more likely to occur.” Holder v. Humanitarian Law Project, 130 S.Ct. at 2728. Accordingly, while a substantial step to commit a robbery must be conduct planned clearly to culminate in that particular harm, a substantial step towards the provision of material support need not be planned to culminate in actual terrorist harm, but only in support — even benign support — for an organization committed to such harm. See generally id. at 2724 (discussing Congress’s finding that designated foreign terrorist organizations “ ‘are so tainted by their criminal conduct that any contribution to such an organization facilitates that conduct’” (quoting AEDPA § 301(a)(7), 110 Stat. at 1247) (emphasis in Humanitarian Law Project).) (3) The Evidence Manifests a Substantial Step Towards the Provision of Material Support in the Form of Personnel The indictment charged Sabir with attempting to supply al Qaeda with material support in three of the forms proscribed in 18 U.S.C. § 2339A(b)(l): “personnel, training, and expert advice and assistance.” Indictment ¶ 2. We conclude that the evidence was sufficient to support Sabir’s conviction for attempting to provide material support in the form of personnel — specifically, himself — to work for al Qaeda as a doctor on-call to treat wounded jihadists in Saudi Arabia. See United States v. McCourty, 562 F.3d 458, 471 (2d Cir.2009) (recognizing that when theories of liability are pleaded in conjunctive, defendant may be found guilty on proof of any one theory); United States v. Masotto, 73 F.3d 1283, 1241 (2d Cir.1996) (holding evidence sufficient to affirm if reasonable jury could have convicted on any theory charged). By coming to meet with a purported al Qaeda member on May 20, 1995; by swearing an oath of allegiance to al Qaeda; by promising to be on call in Saudi Arabia to treat wounded al Qaeda members; and by providing private and work contact numbers for al Qaeda members to reach him in Saudi Arabia whenever they needed treatment, Sabir engaged in conduct planned to culminate in his supplying al Qaeda with personnel, thereby satisfying the substantial step requirement. (4) The Dissent’s Mistaken View of the Substantial Step Requirement (a) Sabir Did More Than Express a Radical Idea When He Produced Himself as a Doctor Sworn To Work Under the Direction of al Qaeda In dissent, Chief Judge Dearie asserts that by upholding Sabir’s attempt conviction on the record evidence, we approve punishing a defendant for radical thoughts rather than criminal deeds. See Dissenting Op., post at [181-82]. We do no such thing. Sabir’s words and actions on May 20, 1995, did more than manifest radical sympathies. See United States v. Crowley, 318 F.3d at 408 (observing that substantial step requirement ensures that attempt does not punish persons “for their thoughts alone”). By attending the May 20, 2005 meeting and committing to work under al-Qaeda’s direction and control as an on-call doctor, Sabir physically produced the very personnel to be provided as material support for the terrorist organization: himself. This supplying of the proscribed object is precisely the sort of substantial step that was missing in United States v. Rosa, 11 F.3d at 340 (holding evidence insufficient to support conviction for attempt to distribute heroin in absence of proof that defendant ever “produee[d] any heroin” or reached agreement with heroin supplier to acquire heroin for planned distribution). Viewed in this context, Sabir’s oath of allegiance to al Qaeda evidenced more than “mere membership” in that terrorist organization. Holder v. Humanitarian Law Project, 130 S.Ct. at 2719 (holding that § 2339B does not criminalize “mere membershi