Related Clues:

• German river
• One who takes capt.'s orders
• See 36-Down
• Milit. rank
• Type choices
• Pulver, e.g., in 'Mister Roberts': Abbr.
• Tilde carriers
• Lt.'s inferior
• U.S.N. officer
• CPR pros
• North Sea feeder
• U.S.N.A. rank
• No one has two of them
• Nav. rank
• Germany's Dortmund-___ Canal