Related Clues:

• American mil. wing
• Milit. branch
• Naval inits.
• Annapolis inits.
• Start of many naval vessel names
• Swabs' grp.
• Letters before many state names
• Start of many ship names
• Adm.'s milieu
• See 51-Across
• Letters starting naval carrier names
• Maritime inits.
• Seagoing letters
• 57-Across letters
• Cruiser letters