the silhouette of Senator John McCain, a Republican from Arizona and chairman of the Senate Armed Services Committee, is seen talking on a mobile phone in a hallway of the U.S. Capitol in Washington, D.C., U.S., on Wednesday, May 25, 2016. Women would be required to register for the military draft, and the White Houses National Security Council staff would be reduced significantly under the fiscal 2017 defense authorization measure approved this month by the Senate Armed Services Committee. Photographer: Andrew Harrer/Bloomberg via Getty Images