In this March 9, 2010, file photo, Gen. James N. Mattis testifies on Capitol Hill in Washington. Defense Secretary Robert Gates says he wants Gen. Mattis to take over U.S. Central Command, replacing Gen. David Petraeus. (AP Photo/Manuel Balce Ceneta, File)

Photo by: Manuel Balce Ceneta

In this March 9, 2010, file photo, Gen. James N. Mattis testifies on Capitol Hill in Washington. Defense Secretary Robert Gates says he wants Gen. Mattis to take over U.S. Central Command, replacing Gen. David Petraeus. (AP Photo/Manuel Balce Ceneta, File)