Armed Forces Day honors all branches of the armed forces of the United States. It is celebrated on the third Saturday of May with military exercises on land, at sea, and in the air. Military installations are usually open to the public on Armed Forces Day. President Harry S. Truman proclaimed Armed Forces Day, and it was first celebrated in May 1950. It replaced three separate celebrations for the Air Force, Army, and Navy. James V. Forrestal, the first secretary of defense, helped unite the armed services under the Department of Defense after World War II ended in 1945.
