What gives you any indication that Trump is a war hawk? He's more isolationist than some republicans. I think he's quite loathe to put our boots on the ground. If he does though, they won't have their hands tied behind their back.
I have a feeling that when Trump cries havoc and let slip the dogs of war, those dogs are not going saddled (or leashed by) with a bunch of stupid ROE.
They are going to be doing what the military does best, killing people and breaking things.