Rear Adm. Brian Brakke, commander of Navy Expeditionary Combat Command (NECC) and NECC Pacific, tests water produced by the light water purification system with Sailors attached to Naval Mobile Construction Battalion (NMCB) 1, Det. Guam as they make preparations for Valiant Shield in Tinian Sept. 5, 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)