 Occasionally, the enlistment contract specifies that some of the service contract be served in the Regular Army, or "active component" (two, three, or four years), with the rest of the service to be served in the reserve component; alternately, some enlistees elect to sign a contract specifying that his or her entire enlistment obligation be served in the reserve component only.In such case, the soldier or enlistee enters directly into the Army Reserve.Those soldiers who serve a period of years in the active component and choose not to re-enlist in the active component are sometimes transferred afterwards to the reserve component to complete their initial service obligation.