The 555th Fighter Squadron (555 FS) is part of the 31st Fighter Wing at Aviano Air Base, Italy. It operates F-16 Fighting Falcon aircraft conducting an air superiority mission.-----The squadron's heritage began on 25 November 1942 when the 555th Bombardment Squadron, Medium, was constituted flying the B-26 Marauder. During World War II, the 555th led offensive actions against Axis forces from bases in England, France, and Belgium. For gallantry in action, the squadron was awarded the first of its four Presidential Unit Citations.