A U.S. Air Force B-52 Stratofortress, U.S. Navy P-8A Poseidon, and a U.S. Air Force E-8 Joint STARS take off from Anderson Air Force Base, Guam to participate in exercise Valiant Shield Sept. 17, 2018.  Valiant Shield is a U.S.-only, biennial field training exercise (FTX) with a focus on integration…