Builder 2nd Class Seth Drennan, from Arkansas, attached to Naval Mobile Construction Battalion (NMCB) 1, Det. Guam, performs a routine check on a MK 28c fuel truck in preparation for Valiant Shield in Tinian, Sept. 4, 2018. Valiant Shield is a U.S. only, biennial field training exercise (FTX) with a focus on integration of joint training in a blue-water environment among U.S. forces. This training enables real-world proficiency in sustaining joint forces through detecting, locating, tracking, and engaging units at sea, in the air, on land, and in cyberspace in response to a range of mission areas. (U.S. Navy photo by Mass Communication Specialist 3rd Class Kryzentia Richards/ Released)