Tensions between the Communist Chinese on the mainland and the Nationalist Chinese on Taiwan dominated FEAF and PACAF during the mid and late 1950s. The 1954 and 1958 Taiwan Strait Crisis both threatened to break out into a war, and USAF F-104C fighter squadrons were deployed to Kung Kuan Air Base on Taiwan in 1958. The question of "Matsu and Quemoy" became an issue in the 1960 American Presidential election when Richard Nixon accused John F. Kennedy of being unwilling to commit to using nuclear weapons if the People's Republic of China invaded the Nationalist outposts.