AR 670-1 governs Army uniform wear, appearance and grooming, authorized uniforms, awards, insignia, and accoutrements.
View AR 670-1 on armypubs.army.mil
It covers uniform composition, classification, authorization, occasions for wear, personal appearance, grooming, and religious accommodations. It also sets requirements for protective clothing, heraldic items, awards, insignia, and uniform use by Reserve, retired, separated, and civilian personnel.
Soldiers will present a professional image at all times and will continue to set the example in military presence, both on and off duty. (paragraph 3-1)
All Soldiers will comply with hair, fingernail, and grooming policies while in any military uniform, or in civilian clothes on duty. (paragraph 3-2)
Violation of the specific prohibitions and requirements set forth in this chapter may result in adverse administrative action and/or charges under the provisions of the UCMJ. (paragraph 3-16)
Wearing of any HQDA-prescribed decoration, service medal, badge, service ribbon, lapel button, or insignia by persons not authorized to do so, or the use of such items to defraud or misrepresent their identification or status, is prohibited. (paragraph 3-14)
Wearing awards is prohibited in the following circumstances: a. On any uniform other than those authorized in this regulation. (See 18 USC 704 for the penalty for unauthorized wear of the uniform.) b. When serving a sentence of confinement. c. When wearing civilian clothing, except for civilian awards, lapel buttons, or rosettes intended for wear with civilian clothing. (paragraph 22-3)