Ark. Code Ann. § 22-7-229

The State of Arkansas hereby cedes concurrent jurisdiction to the United States over the lands, waters, and buildings previously or hereinafter acquired for the United States Army Reserve Center in the City of Hot Springs, Garland County, Arkansas, and over all future lands, waters, and buildings hereafter acquired, leased, or occupied, whether by purchase, condemnation, or otherwise, by or on behalf of the United States for the United States Army Reserve Center.