National Guard of the United States
With the consent of state governors, members or units of the Air National Guard may be appointed, temporarily or indefinitely, to be federally recognized members of the armed forces, in the active or inactive service of the United States. If federally recognized, the member or unit becomes part of the Air National Guard of the United States, which is one of two reserve components of the United States Air Force, and part of the National Guard of the United States. Air National Guard of the United States units or members may be called up for federal active duty in times of Congressionally sanctioned war or national emergency.