WASHINGTON — Defense Secretary Chuck Hagel today approved a recommendation by military leaders that all U.S. troops returning from Ebola response missions in West Africa be kept in supervised isolation for 21 days.

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 Tuesday 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.

In explaining his decision, Hagel noted that the military has more people in Africa helping with the Ebola effort than any other segment of the U.S. government.

“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 U.S. 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.