Related Clues:

• Combat outfit
• Military subdivision
• One of a kind?
• Course division
• The 'U' of B.T.U.
• Cohesive entity
• Beaver's father
• Single item
• ''One Adam Twelve,'' e.g.
• Military assignment
• See 21-Down
• Rental space
• Single thing
• Knot or watt
• Ton, for one