United States war plans (1945–1950)

United States war plans for a conflict with the Soviet Union (USSR) were formulated and revised on a regular basis between 1945 and 1950. Although most were discarded as impractical, they nonetheless would have served as the basis for action had a conflict occurred. At no point was it considered likely that the Soviet Union or United States would resort to war, only that one could potentially occur as a result of a miscalculation. Planning was conducted by agencies of the Joint Chiefs of Staff, in collaboration with planners from the United Kingdom and Canada.

American intelligence assessments of the Soviet Union's capabilities were that it could mobilize as many as 245 divisions, of which 120 could be deployed in Western Europe, 85 in the Balkans and Middle East, and 40 in the Far East. All war plans assumed that the conflict would open with a massive Soviet offensive. The defense of Western Europe was regarded as impractical, and the Pincher, Broiler and Halfmoon plans called for a withdrawal to the Pyrenees, while a strategic air offensive was mounted from bases in the United Kingdom, Okinawa, and the Cairo-Suez or Karachi areas, with ground operations launched from the Middle East aimed at southern Russia. By 1949, priorities had shifted, and the Offtackle plan called for an attempt to hold Soviet forces on the Rhine, followed, if necessary, by a retreat to the Pyrenees, or mounting an Operation Overlord–style invasion of Soviet-occupied Western Europe from North Africa or the United Kingdom.

Despite doubts about its viability and effectiveness, a strategic air offensive was regarded as the only means of striking back in the short term. The air campaign plan, which steadily grew in size, called for the delivery of up to 292 atomic bombs and 246,900 short tons (224,000 t) of conventional bombs.