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490th Civil Affairs Battalion

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490th Civil Affairs Battalion

The 490th Civil Affairs Battalion is a civil affairs (CA) unit of the United States Army Reserve located at the Grand Prairie Armed Forces Reserve Complex in Grand Prairie, Texas and organized under the 321st Civil Affairs Brigade, 350th Civil Affairs Command, United States Army Civil Affairs and Psychological Operations Command (Airborne) or USACAPOC. The 490th is composed of Headquarters and Headquarters Company (HHC) and its four tactical companies, Alpha, Bravo, Charlie, and Delta. The unit was activated for service during World War II, the Berlin Crisis, and Operation Iraqi Freedom (OIF).

The ancestral unit of the 490th Civil Affairs Battalion was constituted in the Army of the United States as the Headquarters and Headquarters Detachment, 90th Military Government Company (also known as the 90th Military Government in some documents) and activated 25 August 1945 at the Presidio of Monterey, California, just days after Japan's surrender.

The Presidio of Monterrey served as the central mobilization and holding site for all Military Government and Civil Affairs forces from all branches of service (mainly US Navy and US Army) in response to the realization for a need to successfully manage the occupations of Europe and Japan for reconstruction. The training center was named the Civil Affairs Staging Area (CASA).

An August report from the commander of the CASA to the Civil Affairs Division (re-designated in 1960 as the Civil Affairs Branch) described physically demanding field exercises involving ruck marches, amphibious assault, scaling cliffs, and infiltration through perimeter defenses, which were "geared toward a possible invasion of Japan before military government teams could assume occupation duties."

After Japan's surrender, the preparations for invasion proved unnecessary.

In December 1945, the 90th Military Government deployed to Japan under the Headquarters, Eighth United States Army and General Douglas MacArthur, the Supreme Commander of the Allied Powers (SCAP). Personnel likely wore the Eighth Army patch once they deployed to Japan.

According to an operational map of military government units in Japan as of January 1946, the 90th Military Government is designated as a company-sized element operating in Kanazawa, Ishikawa Prefecture.

In Kanazawa, personnel of the 90th Military Government supported Japanese administrators, maintained public services for the populace, and secured local artifacts and monuments (such as Kanazawa Castle) from potential looting and black market operations.

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