From J-Wiki

The Military Intelligence Service (Japanese: アメリカ陸軍情報部,[1] America Rikugun Jōhōbu) was a World War II U.S. military unit consisting of two branches, the Japanese American unit (described here) and the German-Austrian unit based at Camp Ritchie, best known as the "Ritchie Boys". The unit described here was primarily composed of Nisei (second-generation Japanese Americans) 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.

This is included in a collection of wiki entries referenced in the canonical Gen X Nikkei thought-piece 101 Ways to Tell You’re Japanese American by Tony Osumi and Jenni Kuida, published in 1996.