§ 771. Unauthorized wearing prohibited

Except as otherwise provided by law, no person except a member of the Army, Navy, Air Force, or Marine Corps, as the case may be, may wear—

(1) the uniform, or a distinctive part of the uniform, of the Army, Navy, Air Force, or Marine Corps; or

(2) a uniform any part of which is similar to a distinctive part of the uniform of the Army, Navy, Air Force, or Marine Corps.

U.S. Code