A unit in the U.S. Air Force larger than a division but smaller than a command.
A branch of the military mainly devoted to air warfare, as opposed to (land) army and navy.
An army of trained civilians, which may be an official reserve army, called upon in time of need, the entire able-bodied population of a state which may also be called upon, or a private force not under government control.
Synonym of militsia: the national police force of certain countries (e.g. Belarus).