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100th Infantry Battalion

The 100th Infantry Battalion is the only infantry unit in the United States Army Reserve. In World War II, the then-primarily Nisei battalion was composed largely of former members of the Hawaii Army National Guard. The 100th saw heavy combat during World War II before and after combining with the 442nd Infantry Regiment, another mostly Nisei military unit, into a single fighting combat team. Based at Fort Shafter, Honolulu, Hawaii, the 100th Battalion has reservists from Hawaii, American Samoa, Guam and Saipan, and has deployed to Iraq and Kuwait. The unit was unofficially nicknamed the "Purple Heart Battalion", with the motto "Remember Pearl Harbor". In 2014, under the U.S. Army's new "Associated Units" program, the 100th Infantry Battalion has been aligned under the Regular Army's 3rd Infantry Brigade Combat Team, 25th Infantry Division.
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  • Background 

  • Formation 

  • Africa and Italy 

  • Monte Cassino 

  • Anzio, Rome, and the 442 

  • Demobilization and rebirth 

  • Recognition 

  • Lineage following World War II 

  • Campaign participation credit