The 19th Weapons Squadron is a non-flying United States Air Force unit, assigned to the USAF Weapons School at Nellis AFB, Nevada. Originated as the 19th Observation Squadron, activated 5 February 1942, redesignated the 19th Tactical Air Support Squadron on 17 June 1963. The 19th originally flew antisubmarine missions during World War II, then moved to China in 1944 to begin observation missions in support of Chinese ground forces and later flew resupply missions to resistance forces operating behind enemy lines in French Indochina. From 1963 through 1968 the 19th Tactical Air Support Squadron flew forward air support and observation missions over Vietnam until its mission was transferred to Osan AB, South Korea in 1972, where it provided Eighth US Army and Republic of Korea ground forces