XO is executive officer. For destroyer, the CO is usually a commander
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送交者: steven 于 2008-11-12, 22:56:51:
回答: X.O. = Executive Officer？仅次于舰长（Captain) 由 寻一正 于 2008-11-12, 19:26:02:
Captain is the next higher ranking officer of commander. Usually the COs (commanders) called skipper.
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