Early in the war, or in open water, I try to time my attacks at dawn or dusk in order to make a proper identification. Trying to detect a flag color in the pitch dark of night is nearly impossible.
After the US joins the war, I usually figure that anything without running lights going to or coming from the UK must be hostile. A risk, yes, but what's war without a little risk. (P.S. don't tell BdU)
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