From a strategic perspective, the U.S. military has spent the last two decades trying to overcome the "Pax Americana" reputation by working with African governments. This is a great opportunity to send in the civil affairs and medical teams to help with relation-building (instead of nation-building)... while gaining real-world experience with handling epidemics and other nasty disease control. Interpreters, public affairs staffs, logistics, construction-- there's a lot of practical skills that the military can apply to help the medical staffs and the NGOs.
Maybe they can also treat patients with other diseases or syndromes, and build a school or two. But when it comes to budget negotiations, AFRICOM does not want to be sitting in their air-conditioned HQ writing point papers about engagement and partnerships.
I doubt that any of the troops could bring a case of Ebola back to the family. I'd be more worried about malaria and a host of other contagious diseases that could slip through a homeward-bound screening.