Infantry Against Ebola?

One more thought on Ebola. For the life of me, I can't figure out why we sent Army soldiers to Africa to do something about Ebola. It seems to me that they're just going to become disease vectors. Allegedly they're there to set up testing and treatment labs.

Eventually, up to 4,000 military personnel are expected to be deployed to West African countries battling the Ebola outbreak

It seems like a force that size will be devoured by both the country and the virus.

Do we keep them in quarantine before we let them back in the country?