(From left to right) Observers from the Republic of Singapore, Australia, the United States, and the Republic of Korea, watch members of the ROK Air Force learn and demonstrate rapelling techniques April 22, 2018, at Andersen Air Force Base, Guam. All four partner nations combined their expertise for Silver Flag, a routine training exercise designed to test military civil engineers on their mission and contingency readiness. (U.S. Air Force photo by Tech. Sgt. Jake M. Barreiro)
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