U.S. Coast Guard Cutter Bertholf (WMSL 750) crew receives fuel from the USNS Walter S. Diehl (T-AO 193) during an underway replenishment in the East China Sea, April 5, 2019. The fuel received during the underway replenishment allows Bertholf to stay in the operational area for a longer period of time. U.S. Coast Guard photo by Petty Officer 1st Class Matthew S. Masaschi.