Engineman Fireman Spencer Tallis performs maintenance on a cooler for the ship's service turbo generator No. 3 aboard the valve barge (YRDM5) alongside the Nimitz-class aircraft carrier USS Carl Vinson (CVN 70). Carl Vinson is currently pier side at Naval Air Station North Island undergoing planned incremental availability. The U.S. Navy is reliable, flexible, and ready to respond worldwide on, above, and below the sea. Join the conversation on social media using #warfighting. (U.S. Navy photo by Mass Communication Specialist 3rd Class Heather Roe)