Port side is good, for the skipper of the USN Ship, it means the civilian ship was on the left side and should have given way.  Unlike the Fitzgerald incident where the entire Officer group has been fired, that ship was hit on the right side, a ship must give way, yield,  to another on it's right side.

But all USN ships would have been given Orders to be extra cautious around civilian ships, this will be bad on the McCain.