US troops are deployed in West Africa to______.

(3)There are more than 1, 000 US troops in West Africa helping prevent the spread of Ebola. Thousands more are set to deploy. Some people in the Army are required to stay in enforced isolation when they return to their base in Italy.
    But for civilians who’ve traveled to the US from Ebola-stricken areas, that’s up for debate. The US government has revised its guidelines a couple of times now. Some criticize it for overreacting to the Ebola threat. Some call CDC’s guidelines too confusing. Some criticize it for not doing enough to protect Americans.
    But here’s the thing: the CDC doesn’t have the authority to enforce its guidelines, States do. And a few have added their own regarding who gets isolated and when. It’s not illegal, the Constitution allows states to impose stricter health regulations than the federal government. But they can’t be challenged.