You continue to misunderstand. The details vary by service, but generally when enlisting you get a choice between open enlistment or enlistment in a particular

You continue to misunderstand. The details vary by service, but generally when enlisting you get a choice between open enlistment or enlistment in a particular specialty or skill set. Again, depending on the service, in many cases you can enlist for a guaranteed job role. Even in the case that you do open enlistment, when it comes down to it, no one in the US military is going to force you to go into combat with a gun to your back commissar style, as that's obviously incredibly likely to backfire, and in the worst case, backfire in a way that gets lots of other people killed to. My friends that saw combat knew what their options were within the military and what they were signing up for. They may have had an idealized picture of what combat would be like, or the odds of a conflict happening, but they weren't forced into a combat role against their will. I'm all for criticism of the military system of the US, but that needs to be grounded in reality.