 He raised the proportion of Strategic Air Command (SAC) strategic bombers on 15-minute ground alert from 25% to 50%, thus lessening their vulnerability to missile attack.In December 1961, he established the United States Strike Command (STRICOM).Authorized to draw forces when needed from the Strategic Army Corps (STRAC), the Tactical Air Command, and the airlift units of the Military Air Transport Service and the military services, Strike Command had the mission "to respond swiftly and with whatever force necessary to threats against the peace in any part of the world, reinforcing unified commands or... carrying out separate contingency operations."