- OBA
Oxygen Breathing Apparatus-device used to supply oxygen while fighting a
fire
- Off Duty
Daytime hours when finished with one duty shift in which you were put to work doing other make-work jobs, if you couldn't hid out somewheres (see "Foul Weather Locker").
- Officers Country
The shortcut you used when you didn't think that you would get caught.
- Old Man
The Captain of a ship.
- Old Salts
Anyone in their mid-twentys or older. Irritating old bastards that constantly tell the young swabs how good they've got it compared to the "old days".
- On the Double
Move fast, or do it at once.
- On Duty (or "On Watch")
The four to eight hours a day you practice your trade when at sea and put in on the quarterdeck when in port.
- On Report
A chit or report signed by an officer regarding a sailor's offense.
- On Watch (or "On Duty")
The four to eight hours a day you practice your trade when at sea and put in on the quarterdeck when in port.
- Oscar
The dummy thrown overboard to perform "man-overboard!" drills.
- Overhead
The ceiling
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