What regulation covers the wear of the uniform?

The regulation that covers the wear of the uniform is indeed AR 670-1, which specifically outlines the policies and standards for the Army military uniform and insignia. It provides detailed information regarding the proper attire for various conditions and occasions, emphasizing professionalism and maintaining standards within the U.S. Army. CCR 145-2 complements AR 670-1, especially in the context of wearing uniforms at Army Cadet Command events, ensuring a consistent standard among Cadets while reinforcing discipline and military customs.

The other regulations mentioned, although relevant to different aspects of Army operations, do not specifically focus on uniform wear. For instance, AR 540-6 addresses Army casualty operations, AR 700-25 relates to the supply and acquisition of property, and AR 350-1 deals with training, which does not include guidelines on uniform standards. The primary focus of AR 670-1 and its companion regulation makes option A the correct answer.