170922-N-KC543-063 NORFOLK (Sept. 22, 2017) Information Systems Technician 3rd Class Shandon Williams uses a stationary bike during a physical fitness test for the Nimitz-Class aircraft carrier USS George Washington (CVN 73). George Washington is undergoing a refueling and complex overhaul (RCOH) at Newport News Shipyard. RCOH is a four-year project performed only once during a carrier’s 50-year service life that includes refueling of the ship’s two nuclear reactors, as well as significant repair, upgrades and modernizations. (U.S. Navy photo by Mass Communication Specialist 2nd Class Alora R. Blosch/Released)