Army Uniform Regulations 670-1 and DA PAM 670-1
The U.S. Army Regulation 670-1 and Department of the Army Pamphlet 670-1 are the definitive regulations governing the design, appearance, wear and issue of the uniforms of the U.S. Army, U.S. Army Reserves, Army National Guard, and State Defense Forces.
U.S. Army Regulation 670-1 - Wear and Appearance of Army Uniforms and Insignia
Department of the Army Pamphlet 670-1 - Guide to the Wear and Appearance of Army Uniforms and Insignia