SAC obtained almost independent target selection by 1955. The Air Force often used target lists to justify greater weapons production, then greater spending on delivery systems for the additional weapons. Although other services opposed such "bootstrapping", they did not have the IBM 704 computer that SAC used to analyze target priorities so could not offer competing selection lists. Its Basic War Plan of March 1954 planned for up to 735 bombers to simultaneously and massively attack all targets, military and urban, in the USSR. Eisenhower preferred to avoid civilian targets, and by 1954 several Air Force planners advocated a "no-cities" strategy. Other planners and USAF leadership, however, believed that the Soviet Union could support its ""immense" armed forces for at least two years of intensive warfare" if industrial and government centers were not attacked. The possibility existed, they believed, that SAC could in fact deliver a "decisive" attack on the USSR, a tempting idea given the power of the 15-megaton hydrogen bombs being tested. LeMay stated in a 1988 interview that