This military technical term describes the formal process of enrolling soldiers into military service. Classical sources use it of recruiting both citizen soldiers and mercenaries, often noting recruitment from allied territories. Paul employs the metaphor of military service to encourage Timothy's single-minded devotion, noting that no soldier on active duty entangles himself in civilian affairs in order to 'please the one who enlisted him.' The military imagery evokes loyalty, discipline, and focus on the commanding officer's objectives. Christian ministry becomes analogous to military service, requiring similar dedication.