170426-N-PD309-058 CHANGI, Singapore (April 26, 2017) Sailors assigned to Helicopter Sea Combat Squadron (HSC) 23 service a nitrogen bottle aboard the littoral combat ship USS Coronado (LCS 4). The ship is on a rotational deployment in U.S. 7th Fleet area of responsibility, patrolling the region's littorals and working hull-to-hull with partner navies to provide the U.S. 7th Fleet with the flexible capabilities it needs now and in the future. (U.S. Navy photo by Mass Communication Specialist 3rd Class Deven Leigh Ellis/Released)