The move goes beyond precautions recommended by the Obama administration for civilians, although President Barack Obama has made clear he feels the military's situation is different from that of civilians, in part because troops are not in West Africa by choice.
Hagel said he acted in response to a recommendation sent to him yesterday by Army Gen Martin Dempsey, chairman of the Joint Chiefs of Staff, on behalf of the heads of each of the military services. They cited numerous factors, including concerns among military families and the communities from which troops are deploying for the Ebola response mission.
"This is also a policy that was discussed in great detail by the communities, by the families of our military men and women, and they very much wanted a safety valve on this," he said at a public forum in Washington.
Just over 1,000 US troops are in Liberia and Senegal supporting efforts to combat the virus. Their numbers could grow to 3,900 under current plans. None are intended to be in contact with Ebola patients.
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As originally envisioned, Pentagon policy called for troops returning to their home bases from Ebola response missions to undergo temperature checks twice a day for 21 days to ensure they are free of Ebola symptoms and would not be permitted to travel widely. But they were not to be quarantined and kept from contact with others.
The Army, however, acting on its own this week, put a small number of returning soldiers in a 21-day quarantine in Italy. That group was the first to return from West Africa after Ebola duty.