The 558th Tactical Fighter Squadron (558 TFS) was an operational unit of the United States Air Force, originally activated during World War II. Reactivated during the Cold War, the squadron became part of the 12th Tactical Fighter Wing and flew the F-4 Phantom II. The 558 TFS deployed to Southeast Asia, where it participated in combat operations during the Vietnam War, conducting tactical fighter missions including close air support, interdiction, and air superiority. The squadron was inactivated in the early 1970s as part of postwar force reductions.