1. a person who enlists or joins a military service voluntarily
Usage: common in military contexts
2. a person who enlists support or participation for a cause or project
Usage: less common; derived sense

Examples

• The enlister signed up for a four-year commitment in the Navy.
• Many enlisters joined the armed forces after high school.
• As an enlister of volunteers, she was skilled at motivating people to join the campaign.
• The enlister at the recruitment office answered all of his questions about military service.
• During wartime, enlisters were often celebrated as patriots in their communities.