Also after the deployment of forces to Far East Air Force in order to engage in combat over Korea, the history of Fifteenth Air Force becomes indistinguishable from that of Strategic Air Command. During the Cold War, Fifteenth Air Force aircraft stood nuclear alert, providing a deterrence against an attack on the United States by the Soviet Union. During the Vietnam War, squadrons of 15th Air Force B-52 Stratofortesses (B-52Ds mostly, some B-52Gs) were deployed to bases on Guam, Okinawa and Thailand conducting Arc Light strikes on communist forces.