The 523d Fighter Squadron is an inactive United States Air Force unit. Its last assignment was with the 27th Operations Group stationed at Cannon Air Force Base, New Mexico.During World War II, its predecessor unit, the 17th Bombardment Squadron (Light) fought in the Philippines Campaign (1941–1942). Its ground personnel fought as infantry in the 1941-1942 Battle of Bataan with the survivors being forced to march as prisoners in the Bataan Death March.