MULLEN TESTIMONY Defense Secretary Robert M. Gates and Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, testify at the U.S. Senate Appropriations Committee's defense subcommittee on Capitol Hill in Washington, D.C., June 15, 2011. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 094917-B-SHN25-337.jpg Photo Gallery