We are in a very tenuous position politically. We have the weakest president in my adult life sitting in the White House. He is EXTREMELY vulnerable politically. An increasing number of people, not only in the US but around the world, think he is feebleminded. One thing that such a president might do is to try to shore up domestic support by doing something really big militarily. Something like... I don't know a daring rescue mission to free American hostages held prisoner in the Middle East (Carter). Or launching a bunch of missiles at a bunch of meaningless terrorist camps in the desert (Clinton). Or attack a hostile country's naval vessels, or their nuclear facilities. Something splashy to shut up domestic critics constantly calling on him to DO SOMETHING.
...and that could totally blow up in our faces and into a major regional conflict, where a whole bunch of other US service members, who AREN'T named "Biden" or "Obama" or "Pelosi" or "Trump" are going to die.