The Republic Aviation Company F-84 Thunderjet was an American-built turbojet fighter-bomber aircraft. Originating as a 1944 United States Air Force proposal for a daytime fighter, the F-84 flew in 1946. Although it entered service in 1947, the Thunderjet was plagued by so many structural and engine problems that a 1948 Air Force review declared it unable to execute any aspect of its intended mission and considered cancelling the program. The aircraft was not considered fully operational until the 1949 F-84D model and the design matured only with the definitive F-84G introduced in 1951. In 1954, the straight-wing Thunderjet was joined by the swept-wing F-84F Thunderstreak fighter and RF-84F Thunderflash photo reconnaissance aircraft.
The Strategic Air Command had F-84 Thunderjets (F-84s and RF-84s) in service from 1948 through 1957.
The Thunderjet became the Air Force's primary strike aircraft during the Korean War, flying 86,408 missions, dropping 111,171,000 pounds (50,427 tons) of bombs and 12,258,000 pounds (5,560 tons) of napalm, and destroying 60% of all ground targets in the war as well as eight Soviet-built MiG fighters. Over half of the 7,524 F-84s produced served with NATO nations.
The F-84 was the first aircraft to fly with the U.S. Air Force Thunderbirds demonstration team, the first production fighter aircraft to utilize in-flight refueling, and the first single-seat fighter capable of carrying a nuclear bomb.