Enlistment is the process of JOINING a military service, and can involve a variety of activities such as TOUR, REGISTRATION, JOINING, ENROLMENT, CONSCRIPTION, and TOUR of duty. TOUR is a four letter word that refers to a period of time spent in the military, while REGISTRATION is a twelve letter word that involves signing up for military service. JOINING is a seven letter word that describes the act of becoming part of the military, and ENROLMENT is a nine letter word that is similar to REGISTRATION. CONSCRIPTION is a twelve letter word that refers to the compulsory enlistment of people into the military, and TOUR of duty is a ten letter word that describes a period of time spent in the military.