FILE - In this Dec. 9, 2011, file photo, Joint Chiefs Chairman Army Gen. Martin Dempsey speaks at the Atlantic Council in Washington. Dempsey says the problem of rogue Afghan soldiers and police turning their guns on American and allied troops is a &quot;very serious threat&quot; to the war effort. Dempsey says the Afghan government needs to take the problem as seriously as do U.S. and NATO commanders and officials. He says &quot;you can&#39;t whitewash&quot; the problem, and that it can&#39;t be fixed by just working harder. (AP Photo/Charles Dharapak, File)