U.S. reverses in Korea and the continued priority accorded to European security resulted in rapid, substantive changes in U.S. defense policies, including a long-term expansion of the armed forces and increased emphasis on military assistance to U.S. allies. In addition, Truman recoiled from Johnson's “inordinate egotistical desire to run the whole government.” Truman later noted how Johnson had “offended every member of the cabinet. . . He never missed an opportunity to say mean things about my personal staff.” Finally, concerned about public criticism of his handling of the Korean War, Truman decided to ask for Johnson's resignation. On September 19, 1950, Johnson resigned as Secretary of Defense, and the president quickly replaced him with General of the Army George C. Marshall.