The 22nd Military Police Battalion began its service as life as the 22nd Criminal Investigation Section, constituted on 2 Match 1944 and activated on 24 March of the same year at Fort Custer, Michigan. It was quickly redesignated as the 22nd Military Police Criminal Investigation Section on 5 August 1944 and again on 25 April 1945 as the 22nd Military Police Criminal Investigation Detachment. In January 1954 its designation was changed to the 22nd Military Police Detachment, a title it would retain until its 1996 redesignation to a battalion.
Battle honors for the Battalion include participation in the New Guinea campaign in the Pacific Theater during World War II and in nine campaigns in Vietnam over the course of a four-year deployment (1968-1972). The Battalion has deployed for several tours in support of the War on Terrorism and Operations Iraqi Freedom and Enduring Freedom, receiving three Meritorious Unit Commendations for its exceptional service and continually placing “Integrity Above All.”
As of Summer 2023, the 22nd Military Police Battalion is assigned to the 6th Military Police Group and is headquartered at Joint Base Lewis–McChord. The Battalion's area of responsibility covers California, Colorado, Kansas and Washington.
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Also known as a unit crest or DUI, a Distinctive Unit Insignia is worn by all Soldiers (except General Officers) in units that have been authorized to be issued the device. It is worn centered on the shoulder loops of the Army Green Service Uniform (AGSU) and the blue Army Service Uniform (ASU, Enlisted only) with the base of the insignia toward the outside shoulder seam. DUIs are not worn on the Dress variations of either uniform, however.