Fort Buchanan is host to a number of tenant activities, most of them branches from the United States Armed Forces Reserve Component such as the headquarters for the 1st Mission Support Command of the United States Army Reserve, the United States Navy Reserve Navy Operations Support Center Puerto Rico (NOSC Puerto Rico) and the United States Marine Corps Reserve. The Puerto Rico National Guard is also present on the base. The Reserve Officer Training Corps (ROTC) has held leadership labs and other activities at Fort Buchanan. Other agencies at the base include the Army and Air Force Exchange Service (AAFES), Defense Commissary Agency (DECA), Rodriguez Army Health Clinic (RAHC), Veterinary Treatment Facility, Defense Military Pay Office (DMPO), and Defense Contracting Audit Agency.