Which regulation outlines the wear and appearance guidelines for Army uniforms?

The regulation that outlines the wear and appearance guidelines for Army uniforms is AR 670-1. This regulation provides comprehensive instructions on what is authorized for wear, including specifics on uniform components, grooming standards, and how to properly display organizational insignia and awards. It is essential for maintaining uniformity, discipline, and professionalism within the Army.

In contrast, other regulations mentioned have different foci: AR 600-20 addresses command policy and the subsequent responsibilities of leaders in maintaining good order and discipline. AR 600-25 deals with the Salute Policy and the treatment of veterans, while AR 600-85 focuses on Army Substance Abuse Program. These regulations are vital for their respective areas, but none address uniform wear and appearance directly like AR 670-1 does, making it the correct choice for this question.