180403-N-JT254-0020 BREMERTON, Wash. (April 3, 2018) Sailors remove a steam-powered catapult chamber on the flight deck of the aircraft carrier USS Nimitz (CVN 68). Nimitz is conducting a planned incremental availability at Puget Sound Naval Shipyard and Intermediate Maintenance Facility where the ship is receiving scheduled maintenance and upgrades. (U.S. Navy photo by Mass Communication Specialist 3rd Class Christopher Jahnke/Released)