Under ideal circumstances, Army units would have a minimum "dwell time," a minimum duration of which it would remain at home station before deployment. Active-duty units would be prepared to deploy once every three years. Army Reserve units would be prepared to deploy once every five years. National Guard units would be prepared to deploy once every six years. A total of 71 combat brigades would form the Army's rotation basis, 42 from the active component with the balance from the reserves.