It is unlawful for any person not an officer or enlisted man of the United States Army, Navy, Marine Corps or Coast Guard, to wear the uniform thereof, or any distinctive part of such uniform or a uniform any part of which is similar to a distinctive part of the duly prescribed uniform thereof; provided, that the foregoing provision shall not be construed to apply to any person authorized to wear such uniform by the laws of the United States, and in particular Section 125 of the National Defense Act as amended (10 U.S.C.A., Section 1393). (Prior code § 6.52.010.)