2) (Mil.) An enlisted soldier or officer that decides to re-enlist to go career
2) "Who's that?"
"That's Captain Anderson; he started out in the 22nd Armored, but ended up here as a tech. specialist. He's thinking about becoming a lifer."
"You're telling me. I heard he's so lazy he married a woman who was pregnant by someone else."
"No Chief. I ain't a lifer. I'm gettin' a real job."