10 U.S.C. § 1584
Employment of non-citizens
Laws prohibiting the employment of, or payment of pay or expenses to, a person who is not a citizen of the United States do not apply to personnel of the Department of Defense.
( Aug. 10, 1956, ch. 1041 , 70A Stat. 118 ; Pub. L. 97–295, § 1(20)(A) , Oct. 12, 1982 , 96 Stat. 1290 ; Pub. L. 101–510, div. A, title XIV , §§ 1481(d)(1), (2), 1482(b), Nov. 5, 1990 , 104 Stat. 1706 , 1709; Pub. L. 104–106, div. A, title X, § 1062(b) , Feb. 10, 1996 , 110 Stat. 444 .)