In 1947, the Cold War was in full swing, leading to the U.S.’s need for a more efficient and manageable foreign policy-making establishment.
As a solution, President Harry Truman signed the National Security Act of 1947 on Sept. 18, 1947. This act, among other authorizations, separated the U.S. Army Air Corps from the U.S. Army, thus creating the U.S. Air Force.