Adm. Mike Mullen responds to questions during testimony. Chairman of the Joint Chiefs of Staff Adm. Mike Mullen responds to questions during testimony with Under Secretary of Defense Comptroller Robert Hale and Secretary of Defense Robert M. Gates before the Senate Armed Services Committee in Washington, D.C., on Feb. 2, 2010. SHARE IMAGE: Download Image: Full Size (0.04 MB) Photo By: VIRIN: 394489-Z-JCN97-599.jpg Photo Gallery