Two things with that. Our armed forces are all volunteer based. They typically choose the roles they want to perform prior to boot camp. If they chose combat roles...that means they want to go into combat.
More importantly....any impeachment of the current President would not change a thing. If you are unhappy ..you just have to suck it up until the next election. The only thing an impeachment would give you is a participation trophy given he could still communicate with every single individual in his Administration as a private citizen. The only thing that would change is the authority of him to exercise power. That would then fall into the hands of JD Vance..on down the line....