An F35B Lightning II Joint Strike Fighter jet with Marine Fighter Attack Squadron (VMFA) 121 is staged during Exercise Valiant Shield 18 at Andersen Air Force Base, Guam, Sep. 15, 2018. Exercise Valiant Shield is a biennial, U.S. only, field training exercise (FTX) with a focus on integration of joint training among U.S. forces in relation to current operational plans. 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.