170711-N-SO730-085 MEDITERRANEAN SEA (July 11, 2017) Hospital Corpsman 1st Class Christina Sizemore, left, and Ships Surgeon Lt. Cmdr. Krista Puttler 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)