The Army National Guard (ARNG), in conjunction with the Air National Guard, is an organized militia force and a federal military reserve force of the United States Army. They are simultaneously part of two different organizations: the Army National Guard of each state, most territories, and the District of Columbia (also referred to as the Militia of the United States), and the Army National Guard of the United States (as part of the federalized National Guard). The Army National Guard is divided into subordinate units stationed in each U.S. state and territory, as well the District of Columbia, operating under their respective governors and governor-equivalents.