U.S. Central Command Commander-nominee Marine Corps Gen. James Mattis , right, is greeted on Capitol Hill in Washington, Tuesday, July 27, 2010, by Senate Armed Services Committee Sen. Carl Levin, D-Mich., prior to testifying before the committee's hearing on his nomination. (AP Photo/Alex Brandon)

Photo by: Alex Brandon

U.S. Central Command Commander-nominee Marine Corps Gen. James Mattis , right, is greeted on Capitol Hill in Washington, Tuesday, July 27, 2010, by Senate Armed Services Committee Sen. Carl Levin, D-Mich., prior to testifying before the committee's hearing on his nomination. (AP Photo/Alex Brandon)