The U.S. Army service uniform is the military uniform worn by personnel in situations in which non-formal dress is called for. It is worn in most workday situations in which business dress would be called for. It can be worn at most public and official functions.
The green service uniform is slowly being replaced by the blue uniform.
The blue Army Service Uniform (ASU) is the "new" service uniform, and was adopted for optional wear in 2008. It was issued to new soldiers starting in the fall 2010, and must be worn army-wide as mandatory wear after October 2015. The ASU is replacing two uniforms already in use – the "Army Green" service uniform and the "Army White" service uniform. It will be based on the current dress uniform known as the "dress blue" uniform. It has its roots in the "Army Blue" uniform, which dates back to the Revolutionary War, in which the Continental Army outfitted its soldiers in blue to distinguish them from the red uniform coats of the British Army. It also recalls the Civil War Union Army's blue uniforms.
History of the Army uniform
Army Service Uniform TimelineAR 670-1, Wear and Appearance of the Army Uniform InsigniaAn Evolution of a uniform.
1779: Blue Continental Army coat, with state facing colors, and white waistcoat and breeches or overalls.
1782: Red facings only with branch of service white (infantry) or yellow (artillery) metal......