When did us army uniforms switch from green to blue?

The U.S. Army officially transitioned from green to blue uniforms in 2010, with the introduction of the Army Service Uniform (ASU). The ASU, which features a dark blue coat, was designed to replace the green Army Class A uniform that had been in use since the 1950s. This change was part of a broader effort to modernize the Army's appearance and maintain a more uniform look across the service. The transition was completed for most soldiers by 2015.