Earlier quoted context omitted.
yes, movies like Tears of the sun. considering the number of US citizens, they are all over planet and it's a rather unreasonable expectation. generally US citizenship meant much more in the past than it means now since there are more interesting places to live (albeit in long term US might still prove as best spot... or not).
When the most recent war broke out in Yemen, the Indian govt managed to evacuate its citizens from Yemen using their navy and if you take into account the size of the Indian diaspora in the Arabian Peninsula including Yemen, it wasn't an easy feat and I can't imagine that the USG wouldn't be capable of carrying out a similar evacuation plan or doing what it could to get their citizens out of harm's way abroad.
Also the Americans I knew seemed to expect helicopters to come pick them up and all that. Saying to your citizens they need to get out and we've got a navy ship in port that you can get on if you want isn't really evacuating your citizens.