Defense Secretary Chuck Hagel, left, and Army Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, appear before the Senate Armed Services Committee, the first in a series of high-profile Capitol Hill hearings that will measure the president's ability to rally congressional support for President Barack Obama's strategy to combat Islamic State extremists in Iraq and Syria, in Washington, Tuesday, Sept. 16, 2014. Obama last week outlined his military plan to destroy the extremists, authorizing U.S. airstrikes inside Syria, stepping up attacks in Iraq and deploying additional American troops, with more than 1,000 now advising and assisting Iraqi security forces to counter the terrorism threat. (AP Photo/J. Scott Applewhite)