1. Naval service aboard a ship at sea
   - sea-duty, shipboard duty

Type of: assignment, duty assignment

• 11th
• 12
• 12-tone music
• 12-tone system
• 120
• 120th
• 125
• 125th
• 12th
• 13
• 130
• 130th
• 135
• 135th
• 13th
• 14
• 14 July
• 140
• 140th
• 144
• 145
• 145th
• 14th
• 15
• 15 August 1945