That they're trained for that, and some would die. Personally I think it's inevitable that deploying 4 to 6 thousand military personnel, upwards of 50% probably under 30, in a population with a high incidence of communicable disease, some will come down with it. I'm not crazy about the mission, I think contractors should have been used if possible. Nor am I nuts about the unit choice. But if we're going to do it because no on can, I hope we're prepared to deal with the casualties.
Nor am I, but I think the use of contractors, not under military discipline, would make unintended consequences more, not less likely.