Clue 3, remember that statement when the Coast Guard blows your sailing boat out of the water.
What an idiotic response.
The Coast Guard would not blow a sailboat out of US waters without active attempts to ID it first -- but they might blow a sailboat out of the waters around the Iraqi oil terminals in the Persian Gulf if that sailboat was on a quick pace into a restricted area. And that would be mighty prudent of them to do so.
The Liberty was in a active, hot, war zone. Not a polite place. An extremely dangerous place. They were there without the proper precautions and a number of good young US sailors and citizens died on account of that foolish and reckless operation in absence of proper precaution.