Related Clues:

• One with no hope of getting out
• Career officer
• One who serves long?
• 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
• Long-term convict
• Unpardonable one?
• One with much time on his hands
• Permanent cell occupier