561st Fighter Squadron ACC is a unit within the United States Air Force. The squadron, based at Eglin Air Force Base, Florida, operates the F-35 Lightning II stealth multirole fighter aircraft. Established in 1942 as a P-38 Lightning squadron during World War II, it has since been redesignated multiple times, serving under various fighter and attack aircraft throughout its history. The 561 FS ACC’s mission involves air dominance, close-air support, and the conduct of integrated operations within joint, multinational, and coalition forces as part of the Air Combat Command.