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Thank you, Sven and Richard. I chose to use acting skipper at the time. The following text illustrates one example of acting skipper:
At Pearl Harbor, Burdick Brittin saw an ensign take command of his destroyer. On April 11, 1945, it was his own turn to take charge.
Brittin: “With Ensign Stanley Caplan—who was officer of the deck at that time—as acting skipper, we went out of the harbor shooting with every weapon we had, like everybody else”
http://www.thehistorynet.com/mh/blburdickbrittin/ 2 KudoZ points were awarded for this answer