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Someone in the military, especially Navy or Marines, who stays in because he's too scared of civilian life. Not all career military are lifers. Someone who is "career" is respected because they stay in because they like it, whereas a lifer hates being in the military but is too scared they will end up sleeping in their car if they get out (which sometimes happens). A lifer is basicly serving a self-imposed life sentence in the military. Lifers will kiss every ass above them in the chain of command and will try to make everyone else around them as miserable as they are.
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