Uniform system
The Army's uniforms and when each one is worn
The utility, service, dress, and mess uniforms, what each is for, and who decides which one you wear on a given day.
The Army runs a small number of uniforms with clear roles. The confusion is almost always about the middle of the range, where the service uniform and the dress uniform overlap, and about which configuration of a uniform is required for a given event. AR 670-1 authorizes the uniforms and their components; DA PAM 670-1 illustrates them. The commander sets the uniform of the day, and the invitation or the operation order sets it for an event.
| Uniform | What it is | When it is worn |
|---|---|---|
| Army Combat Uniform (ACU) in the Operational Camouflage Pattern | The utility and field uniform. | Daily duty in most units, field training, and deployment. The default uniform of the day. |
| Army Green Service Uniform (AGSU) | The everyday service uniform: olive coat, taupe trousers or slacks, tan shirt. | Office duty, official travel, professional schools, briefings, and most official business away from the field. |
| Army Service Uniform (ASU), the blue uniform | The dress uniform. | Ceremonies, formal and semiformal social functions, and occasions where a dress uniform is specified. |
| Army Blue Mess and Blue Evening Mess uniforms | The formal evening uniforms, the military equivalent of black tie and white tie. | Formal evening social functions when the invitation calls for them. Optional purchase items. |
| Army Physical Fitness Uniform | The Army's PT uniform. | Physical readiness training and fitness testing. Wear rules for off-post and off-duty wear are set by the commander within AR 670-1. |
| Organizational and specialty uniforms | Flight uniforms, hospital duty, food service, maternity, and similar items issued for a specific function. | Worn while performing the duty they are issued for. |
- AR 670-1 applies to the Regular Army, the Army National Guard, and the Army Reserve alike.
- Commanders may prescribe the uniform of the day and may restrict optional items, but they may not authorize a uniform or an item that AR 670-1 does not authorize. There is no such thing as a local uniform variation.
- A Soldier is responsible for wearing the complete uniform. Mixing components across uniforms is not authorized.
- Headgear is worn outdoors while in uniform unless the commander or the situation directs otherwise, removed indoors unless the Soldier is under arms in an official capacity, and not worn inside a privately owned vehicle.