The American Defense Service Medal was a military award of the United States Armed Forces, established by Executive Order 8808, by President Franklin D. Roosevelt, on June 28, 1941. The medal was intended to recognize those military service members who had served on active duty between September 8, 1939 and December 7, 1941.
A similar medal, known as the American Campaign Medal, was established in 1942, for service in the American Theater during the World War II era.