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The National Defense Medal (NDSM) is awarded to members of the United States Armed Forces who serve honorably during a period of national emergency. The medal has been awarded for four specific times periods:
Korean War: June 27, 1950 to July 27, 1954
Vietnam War: January 1, 1961 to August 14, 1974
Gulf War: August 2, 1990 to November 30, 1995
Global War on Terrorism: September 11, 2001 to December 31, 2022
Hat Pin is 1 1/4".