The Military Intelligence Service was a World War II U.S. military unit consisting of two branches, the Japanese American unit and the German-Austrian unit based at Camp Ritchie, best known as the "Ritchie Boys". The unit described here was primarily composed of Nisei who were trained as linguists. Graduates of the MIS language school (MISLS) were attached to other military units to provide translation, interpretation, and interrogation services.

Fort Ritchie in Cascade, Maryland was a military installation southwest of Blue Ridge Summit, Pennsylvania and southeast of Waynesboro in the area of South Mountain. Following the 1995 Base Realignment and Closure Commission, it closed in 1998.