 The 2nd Battalion, 13th Aviation Regiment, which replaced the Unmanned Aircraft Systems Training Battalion (UASTB)(Provisional), is based at Fort Huachuca, Arizona.Its primary mission is to train soldiers in the operation and maintenance of the RQ-7B Shadow and MQ-1C Gray Eagle unmanned aircraft systems.2–13th Aviation is a tenant unit of Fort Huachuca, but its parent unit is the 1st Aviation Brigade at Fort Rucker, Alabama, home of the United States Army Aviation Center of Excellence.