First Sgt. Mario Aguero sights in during Valiant Shield 26, at Apra Harbor, Guam, Sept. 20, 2016. Aguero is the company first sergeant of Company G, 2nd Battalion, 4th Marines. Valiant Shield is a biennial Air Force, Navy and Marine Corps exercise held in Guam, focusing on real-world proficiency in sustaining joint forces at sea, in the air, on land and in cyberspace. ( Marine Corps photo by Lance Cpl. Jorge A. Rosales)

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Keywords: .., air, exercise, expeditionary, force, guam, iii, joint, marine, marines, mef, navy, vs16