180918-N-MU198-036 GUAM (Sept. 18, 2018) Two Mark VI patrol boats assigned to Coastal Riverine Group 1, Detachment Guam, get underway from Naval Base Guam, Sep. 18, 2018, as part of Valiant Shield 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 Danny Ray Nuñez Jr./Released)