Gunner's Mate 2nd Class Lucas Friend and Gunner's Mate 3rd Class Derek Benedict stand watch with a .50-caliber machine gun aboard Nimitz-class aircraft carrier USS Theodore Roosevelt (CVN 71) during transit to Norfolk Naval Shipyard. The nuclear-powered aircraft carrier is currently underway to Norfolk Naval Shipyard for Docked Planned Incremental Availability. U.S. USS Theodore Roosevelt (CVN 71) made a four-hour plus transit of the Elizabeth River in Hampton Roads on March 7, on her way to Norfolk Naval Ship Yard for a nine-month Planned Incremental Availability (PIA). The Navy’s fourth Nimitz-class aircraft carrier will undergo more than 90 major modifications, including a JP-5 (fuel system) alteration and installation of a new electronic throttle system in the ship’s propulsion plants.