160414-N-NW048-012 PORTSMOUTH, Va. (April 14, 2016) Sailors review proper fire fighting instruction during a general quarters drill aboard the aircraft carrier USS George H. W. Bush (CVN 77). USS George H. W. Bush is undergoing a planned incremental availability period at Norfolk Naval Shipyard. (U.S. Navy photo by Mass Communication Specialist Seaman Shanell T. Lawrence/Released)