[nradov]

Bullshit. Most enlistment contracts specify a particular career field. The troops in combat arms are there because they chose that option. The Pentagon isn't going to take a dental assistant and reassign them to infantry unless they specifically request that change (and meet various eligibility criteria).

[amanaplanacanal]

That doesn’t mean that you can’t be sent to a war zone. I’m sure they needed dental assistants in Iraq and Afghanistan too.