The Second Air Force is a USAF numbered air force responsible for conducting basic military and technical training for Air Force enlisted members and non-flying officers. In World War II the CONUS unit defended the Northwestern United States and Upper Great Plains regions and during the Cold War, was Strategic Air Command unit with strategic bombers and missiles. Elements of Second Air Force engaged in combat operations during the Korean War; Vietnam War, as well as Operation Desert Storm.

The II Bomber Command is a disbanded United States Air Force unit. It was established in September 1941, shortly before the attack on Pearl Harbor to command heavy bomber units assigned to Second Air Force. Following the entry of the United States into World War II, it flew patrols off the northwest Pacific coast. However, its main efforts soon began organizing and training heavy bomber units and aircrews. By 1943, the command had become the only command under Second Air Force conducting operational training, and on 6 October 1943 it was disbanded as redundant and its functions absorbed by Second Air Force or transferred to the bomber commands of the other continental air forces.