American Defense Medal M0048

American Defense Medal M0048. The American Defense Medal - WW II (ADSM) is granted to any military personnel who served between September 8, 1939 and December 6, 1941. It is necessary for U.S. Army personnel to actively serve for at least one year during the time period noted above. As for U.S. Navy, U.S. Coast Guard, and U.S. Marine Corps members, they are granted the ADSM for any length of active service during the eligible time frame.