USS Kitty Hawk and USNS Rappahannock (T-AO 204) steam along side each other during a replenishment at sea (RAS). A RAS allows ships to continue conducting their missions without having to return to port for food, fuel, or other needed supplies. Kitty Hawk is conducting work-ups in preparation for an upcoming regularly scheduled deployment. Kitty Hawk is the Navy?s only permanently forward deployed aircraft carrier and is homeported in Yokosuka, Japan. U.S. Navy photo by Photographer?s Mate 3rd Class Lee McCaskill.