170711-N-SO730-144 MEDITERRANEAN SEA (July 11, 2017) Ship's Surgeon Lt. Cmdr. Krista Puttler, left, and Hospital Corpsman 1st Class Christina Sizemore perform surgery aboard the aircraft carrier USS George H.W. Bush (CVN 77). The ship and its carrier strike group are conducting naval operations in the U.S. 6th Fleet area of operations in support of U.S. national security interests in Europe and Africa. (U.S. Navy photo by Mass Communication Specialist 3rd Class Joe Boggio/Released)