The Corsair was designed and operated as a carrier-based aircraft and entered service with the U.S. Navy in late 1944 and early 1945. It quickly became one of the most capable carrier-based fighter-bombers of World War II. On June 25, 1950 South Korea was invaded by the North and soon VMF-323 "Death Rattlers" and their F4U-4 Corsairs’ were flying in support of Pusan. The squadron got its name when pilots killed a 6 foot diamond-backed rattlesnake and hung it in their ready room. VMF-323 also flew support of the Inchon landing, the Chosin Reservoir breakout as well as all other major efforts. Flying alternately from Navy carriers and airfields, their mission changed to interdiction and armed reconnaissance so in June 1952 they became VMA-323. In July 1953 they left Korea.