The history of the Arkansas National Guard and World War II begins with the reorganization following World War I. The State first reorganized a provision unit, the 5th Arkansas, in order to provide a force to deal with domestic situations. As the Defense Department slowly implemented the massive changes and expansions outlined National Defense Act of 1916, the Arkansas National Guard was allowed to reorganize its war time units, including the 153rd Infantry Regiment, the 141st Machine Gun Battalion, and the 142nd Field Artillery. The Guard acquired its first permanent facilities and additional training during its annual encampments. During World War II, the entire Arkansas National Guard was activated and units saw duty in the Pacific and European theaters of conflict.