Air Force Tech. Sgt. Michael Voorhees, 909th Air Refueling Squadron, refuels an F-15C in support of Valiant Shield, Sept 20, 2018. Valiant Shield is a U.S.-only biennial field training exercise 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 Darienne Slack)