200212-N-IE405-1120 PORTSMOUTH, Va. (Feb. 12, 2020) Norfolk Naval Shipyard workers prepare to install a 2400-pound pilgrim nut on a propeller of the aircraft carrier USS George H. W. Bush (CVN 77). George H.W. Bush is currently in Norfolk Naval Shipyard for its Docking Planned Incremental Availability (DPIA). (U.S. Navy photo by Mass Communication Specialist 2nd Class Indra Beaufort/Released)