Used absolutely for that entire branch of the armed forces.
The governmental agency in charge of a state's army.
A large, highly organized military force, concerned mainly with ground (rather than air or naval) operations.
Within a vast military, a very large tactical contingent (e.g. a number of divisions).
The military as a whole.
Any multitude.
A large group of people working toward the same purpose.
A large group of social animals working toward the same purpose.