10 U.S.C. § 771
Unauthorized wearing prohibited
Except as otherwise provided by law, no person except a member of the Army, Navy, Air Force, Marine Corps, or Space Force, as the case may be, may wear—
(1)
the uniform, or a distinctive part of the uniform, of the Army, Navy, Air Force, Marine Corps, or Space Force; or
(2)
a uniform any part of which is similar to a distinctive part of the uniform of the Army, Navy, Air Force, Marine Corps, or Space Force.
( Aug. 10, 1956, ch. 1041 , 70A Stat. 34 ; Pub. L. 116–283, div. A, title IX, § 924(b)(3)(N) , Jan. 1, 2021 , 134 Stat. 3821 .)