Related Clues:

• Off. at sea
• Typesetting spaces
• Thinning in the middle?
• "Ninny" uses three
• Jr. naval officer
• Halves of ems
• Explorer Byrd's rank: Abbr.
• The two in none?
• Naval officer below lieut
• Half of nine
• Three-fifths of ''nanny''
• U.S. Navy off
• Inning's three
• One-point Scrabble letters
• 'Star Trek' extra: Abbr