Related Clues:

• Dinner duo?
• GI rank
• Many an extra on 'Star Trek': Abbr.
• Halves of 54-Across
• Three out of nineteen?
• N N N
• Gomer Pyle, for one
• Many a G.I.
• Funny couple?
• One-third of ninety?
• Printing spaces
• Nixon has two
• Halves of 1-Across
• Widths of typical characters
• Lengths of some dashes