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Members from the U.S. Air Force and Indonesian military conclude exercise Cope West 18 (CW18) at Sam Ratulangi International Airport, Indonesia, March 23, 2018. CW18 is a Pacific Air Forces-sponsored, bilateral exercise involving the U.S. and Indonesian air forces and is designed to advance interoperability and build upon already established partnerships between the air forces. This year marked the second time that U.S. fighter aircraft training has taken place in Indonesia in two decades and the sixth time Cope West has been hosted in Indonesia.