180325-N-IA905-1179 INDIAN OCEAN (March 25, 2018) Quartermaster 2nd Class Ashley D. Martindale explains fathometer readings to Lt. Yashpal Singh, from the Indian navy Talwar-class frigate INS Tarkash (F50), as he tours the Arleigh Burke-class guided-missile destroyer USS Preble (DDG 88) during a crew swap. Preble is underway with the Theodore Roosevelt Carrier Strike Group for a scheduled deployment in the U.S. 7th Fleet area of operations in support of maritime security operations and theater security cooperation efforts. (U.S. Navy photo by Mass Communication Specialist 3rd Class Morgan K. Nall/Released)