Distinguished Service Medal
The Distinguished Service Medal (DSM) was a military decoration awarded until 1993 to personnel of the Royal Navy and members of the other services, and formerly to personnel of other Commonwealth countries, up to and including the rank of Chief Petty Officer, for bravery and resourcefulness on active service at sea. CREDIT:Wikipedia See also: All medals, Victoria Cross, Distinguished Service Order, Distinguished Service Cross, Military Cross, Distinguished Flying Cross, Distinguished Conduct Medal, Military Medal, Mention in Despatches