enlistment
/ɛnˈlɪstmənt/Definitions
1. noun
the act of joining the military or other organization as a member, especially by formal agreement or contract.
“The enlistment of new soldiers was crucial for the success of the army in the upcoming war.”
2. noun
the period during which a person is a member of the military or other organization.
“After serving for 20 years, the veteran’s enlistment period finally came to an end.”