§ 12201.
(b)
Except as otherwise provided by law, the Secretary concerned shall prescribe physical, mental, moral, professional, and age qualifications for the appointment of persons as Reserves of the armed forces under his jurisdiction. However, no person may be appointed as a Reserve unless he is at least 18 years of age and—
(1)
he is a citizen of the United States or has been lawfully admitted to the United States for permanent residence under the Immigration and Nationality Act (
8 U.S.C. 1101 et seq.); or
(2)
he has previously served in the armed forces or in the National Security Training Corps.
([Aug. 10, 1956, ch. 1041], [70A Stat. 24], § 591; [Pub. L. 85–861, § 1(10)(A)], Sept. 2, 1958, [72 Stat. 1440]; [Pub. L. 88–236], Dec. 23, 1963, [77 Stat. 474]; [Pub. L. 89–718, § 4], Nov. 2, 1966, [80 Stat. 1115]; [Pub. L. 90–130, § 1(3)], Nov. 8, 1967, [81 Stat. 374]; [Pub. L. 96–513, title V] § 511(16), Dec. 12, 1980, [94 Stat. 2921]; [Pub. L. 100–180, div. A, title VII, § 718(a)], Dec. 4, 1987, [101 Stat. 1115]; renumbered § 12201 and amended [Pub. L. 103–337, div. A, title XVI], §§ 1631(b), 1662(c)(2), Oct. 5, 1994, [108 Stat. 2964], 2990; [Pub. L. 104–106, div. A, title XV, § 1501(a)(5)(B)], (b)(11)(A), Feb. 10, 1996, [110 Stat. 495], 496; [Pub. L. 108–375, div. A, title V, § 501(c)(3)], Oct. 28, 2004, [118 Stat. 1874]; [Pub. L. 111–383, div. A, title V, § 515], Jan. 7, 2011, [124 Stat. 4213].)