Republic of Singapore Lt. Col. Oon Kok Choon, 428th Fighter Squadron senior ranking officer, left, and RSAF Lt. Eng Jun Chao, 428th FS weapons system operator, right, pose for a photo before heading to Combat Hammer, May 2, 2017, at Mountain Home Air Force Base, Idaho. RSAF flight crew spent the week testing their weapons system capabilities during Combat Hammer.

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