Possible Clues:

• Sgt. or cpl
• 1-Down, for one
• Corporal, e.g
• PFC, e.g
• Private overseer
• Promoted recruit, perhaps
• Army officer like the ones in 8-Across, informally
• Sergeant, say, getting up one day full of himself?
• Military officer appointed from enlisted personnel, in short
• Petty officer, e.g