U.S. Navy Adm. Kirkland H. Donald, center, director of the Naval Nuclear Propulsion Program, salutes as he is greeted by Capt. DeWolfe H. Miller III, commanding officer, during a visit aboard the aircraft carrier USS George H.W. Bush (CVN 77) in Newport News, Va., Sept. 18, 2009. Donald will tour reactor spaces during the ship's post shakedown availability period. (U.S. Navy photo by Mass Communication Specialist 3rd Class Joel S. Kolodziejczak/Released)