A Air Force B-1B Lancer, assigned to the 337th Test and Evaluation Squadron, Dyess Air Force Base, Texas, takes off Sept. 23, 2018, at Andersen AFB, Guam. Valiant Shield is a biennial, only, field training exercise with a focus on integration of joint training among forces. ( Air Force photo by Senior Airman Gerald R. Willis)

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Keywords: .., air, biennial, corps, force, guam, joint, marine, navy, shield, training, valiant, vs18