E-1 through E-3 wear a miniature version of the enlisted combination cap device. Like the Navy and Marine Corps, and in contrast to their Army and Air Force counterparts, the Coast Guard garrison caps for officers also avoid the use of metallic piping. U.S. Air Force A blue flight cap is the most common headgear worn with the U.S. Air Force's service dress or "blues" uniform. The color of the piping varies: solid blue for enlisted, blue and silver metallic braid for company-grade officers and field grade officers, and solid silver metallic for general officers. Officers wear large metal rank insignia affixed to the left front of the cap in a manner similar to that historically used by the Army with their garrison caps. No other accoutrements are worn. The flight cap is also worn by members of the Civil Air Patrol in a manner appropriate to their rank. The company-grade officer version is also worn by United States Air Force Academy and Air Force ROTC cadets as well as officer trainees at officer training school. Cadets in the Junior ROTC and Civil Air Patrol cadet programs wear the enlisted version of the flight cap. Serbia/Yugoslavia In Serbian, the side cap is known as and was introduced to Serbian soldiers in 1870. It was an integral part of the uniform of Serbian soldiers in the Serbian–Turkish Wars (1876–1878), the Serbo-Bulgarian War (1885) and the Liberation Wars (1912–1918). It was used as the official cap of soldiers in the Yugoslav Army and Gendarmerie in the Kingdom of Yugoslavia. During the German-Italian occupation of Yugoslavia in the Second World War it was worn by numerous armed formations. After the war in the new Socialist Federal Republic of Yugoslavia, the official cap was replaced by a which was of the same style as the side cap. was first used by the Yugoslav Partisans during the Second World War and later by the Yugoslav People's Army. The was named after Josip Broz Tito, leader of the partisans, who popularized its use during the war. Since 2020 the Serbian Air Force and Air Defence has used the side cap as standard attire for its pilots. Civil use Officers and Instructors of the Australian Air Force Cadets are also entitled to wear a garrison cap with service dress uniform. Royal Canadian Air Cadets wear wedge caps in Air Force blue as part of their uniform. United