is a specific kind of: enrol, enroll, enter, inscribe, recruit.

is a broader term that covers: levy, raise, recruit.

is the opposite of: discharge, muster out.

derivation: conscription, draft, muster, selective service | enlisting, recruitment | conscript, draftee, inductee | enlistee, recruit | duty tour, enlistment, hitch, term of enlistment, tour, tour of duty.