Related Clues:

• One with no hope of getting out
• Career officer
• One who serves long?
• Nine-to-niner
• Prisoner for good
• Old pro
• Military careerist
• He's in for good
• Prisoner who'll never get out
• Career soldier
• Permanent pen pal?
• Permanent con
• Permanent prisoner
• Nine-to-niner, e.g.
• Long-term convict