troops in France who were given the French type forage cap, as they did not have their wide-brimmed campaign hats with them. The overseas cap could be stored easily when the helmet was being worn. A blue overseas cap was adopted post-war by the American Legion, but the hat largely disappeared from the Army between the wars, with the exception of the Army Air Corps (who called it the "flight cap") where it was authorized in August 1933 and armored units. However it returned in 1939 with a finalized specification as of February 1941. The hat was widely issued from then on as "the garrison cap." With the replacement of the service cap and campaign hat, the garrison cap was given branch of service color piping, as had earlier been the case with the cord of the campaign hat (light blue for infantry, red for artillery, yellow for cavalry, etc.). This practice was discontinued when individuals had to purchase a new hat if they were transferred to a different branch of the service. Officers' piping was similarly carried over from campaign hat cords and continues: warrant officers' caps are piped in silver and black, commissioned officers' caps are piped in gold and black, and general officers' caps are piped in gold. Additionally, starting in World War II military parachutists and glider-born forces wore an Airborne Insignia on their garrison cap—enlisted wore them on the left while officers wore them on the right. Different variants of the Airborne Insignia were worn until later in World War II when parachute and glider formations combined their unit–specific insignia into one red, white, and blue, parachute and glider Airborne Insignia. The Airborne Insignia continued to be authorized for wear on the garrison cap by those assigned to airborne units until the garrison cap was replaced with the U.S. Army's black beret. Until May 2004, it was also part of the initial uniform issue for soldiers who received their green "Class A" Army Service Uniform before becoming military occupation specialty-qualified, and thus allowed to wear the standard black beret. That green service uniform was discontinued in October 2015. In 2020, the US Army introduced a new green service uniform based on the WWII-era "pinks and greens" officers' uniform, which reintroduced the garrison cap to the Army. U.S. Marine Corps The overseas cap ("cover") was first issued to Marines in France in early 1918. Originally Marine