Secretary Gates and Adm. Mike Mullen testify at a hearing of the House Armed Services Committee. Secretary of Defense Robert M. Gates and Chairman of the Joint Chiefs of Staff Adm. Mike Mullen testify at a hearing of the House Armed Services Committee on operations in Libya in the Rayburn House Office Building in Washington, D.C., on March 31, 2011. SHARE IMAGE: Download Image: Full Size (0.05 MB) Photo By: VIRIN: 926440-F-AJQ48-883.jpg Photo Gallery