Regulation is at anchor or dock, under weigh for reviews, dressed-ship, etc
The ensign is the US flag, the flag flow on the bowsprit cap is a "jack" the Revenue Service flag would be at the main truck, the ensign at the "peak" (the peak of the main gaff).
The ensign is the US flag, the flag flow on the bowsprit cap is a "jack" the Revenue Service flag would be at the main truck, the ensign at the "peak" (the peak of the main gaff).