WASHINGTON - SEPTEMBER 15:  Chairman of the Joint Chiefs of Staff U.S. Navy Admiral Mike Mullen (R) talks with Sen. Lindsey Graham (R-SC) before testifying during Mullen's reappointment hearing before the Senate Armed Services Committee September 15, 2009 in Washington, DC. Mullen was originally appointed by former President George W. Bush but has remained in his post as chairman under President Barack Obama, who has shown support for Mullen. Getty Images logo Getty Images 29 months ago

WASHINGTON - SEPTEMBER 15: Chairman of the Joint Chiefs of Staff U.S. Navy Admiral Mike Mullen (R) talks with Sen. Lindsey Graham (R-SC) before testifying during Mullen's reappointment hearing before the Senate Armed Services Committee September 15, 2009 in Washington, DC. Mullen was originally appointed by former President George W. Bush but has remained in his post as chairman under President Barack Obama, who has shown support for Mullen.