The 25th Fighter Squadron began life as the 25th Pursuit Squadron, activated at Hamilton Field, Calif., on Jan. 15, 1941. By March it was assigned to the 51st Pursuit Group at March Field, Calif. In July the squadron received P-40 aircraft. The 25th Fighter Squadron (25 FS) is part of the 51st Fighter Wing at Osan Air Base, South Korea. It operates the A-10 Thunderbolt II aircraft conducting close air support missions.