What are the wartime service periods prior to September 7, 1980 (enlisted) or October 16, 1981 (officer)?

The wartime service periods are as follows:

  * WWII: September 16, 1940 to July 25, 1947

  * Korean: June 27, 1950 to January 31, 1955

  * Vietnam: August 5, 1964 to May 7, 1975