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U.S. Air Force Master Sgt. Juan AguilarMunoz, left, site 2 senior non-commissioned officer-in-charge with 18th Civil Engineering Squadron, observes door installation procedures on a 2-room classroom building during Exercise Balikatan at Alibagu Elementary School, Ilagan, Isabela, Philippines, May 3, 2018. Exercise Balikatan, in its 34th iteration, is an annual U.S.-Philippine military training exercise focused on a variety of missions, including humanitarian assistance and disaster relief, counterterrorism, and other combined military operations held from May 7 to May 18.