enlist (oneself) for something
to sign up for something; to enroll for something. Sam wouldn't enlist for service. Todd enlisted himself for the army last week.
enlist(oneself) in something
to join something; to join the armed services. She decided not to enlist herself in the air force. Bill enlisted in the army.
enlist someone for something
to enroll someone for something; to seek help for something from someone. I enlisted all of them for the understudy parts. Can I enlist you for the committee?
enlist someone in something
to recruit someone into something; to recruit someone into the armed services. They tried to enlist me in the army, but I decided against it. David enlisted his brother in an organization that gave assistance to peasants in South America.