Possible Clues:

• Capt.'s inferior
• Cop's rank: abbr.
• Badge holder: Abbr.
• Private instructor: Abbr.
• Slaughter's rank: abbr.
• Base leader?: (Abbr.)
• Drilling off.
• Towser, e.g., in 'Catch-22': Abbr.
• Cav. member
• Last Army rank of 39-Across: Abbr.