Claim: The M18 Hellcat was a 39,000 lb (20 short tons; 18 t) American tank destroyer and fastest U.S. armored fighting vehicle  manufactured by Buick Motor Division of General Motors that was used during World War II and the Vietnam War
Evidence: M39s saw combat during the Korean War, primarily as armored personnel and munitions carriers and were finally declared obsolete on February 14, 1957.