A deck officer is in the U.S.A. navy which is known as a
Lieutenet.
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Surface Deck Limited Duty Officer
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The "Officer of the Deck" does not have to do with rank, it is a
duty position which rotates between personnel on watch.
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Attention on Deck is called for on the arrival of the Commanding
Officer. It is also used for any Flag grade officer, which is
Captain or Above. The first person to spot the arrival calls the
room to attention.