"I just wonder how they can ORDER you out of International Waters."
If you are a US citizen, you are subject to the US Government, no matter where you are. Including on the high seas. Now, if he was a Brit, he could just thumb his nose at them and say "1812, remember?!" but that's OK...when men on big gray ships try to tell you that you are someplace where you may become collateral damage, if you want to stay there, that's your freedom too.
Someone drops a fuel tank, or fires live munitions, or a nuclear sub does an emergency surface drill under your boat...and you're really going to appreciate the reason why you've been ORDERED out of the area.
The prudent mariner generally avoids sailing in live-fire zones.