Timo wrote:

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US Navy practice until the early 1970's was for commanders and above to be addressed with their rank, lieutenant commanders and below (down to WO-1) to be addressed as "Mister (last name)"
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Hmm... addressed by whom? Everybody, or fellow officers, or superior officers?
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Everybody officially, though juniors could use "sir" instead. I'll look up the full rules later today.
--Justin