ARLINGTON, Va. (Jul. 19, 2017) Rear Adm. David Hahn, chief of naval research, congratulates Capt. Clark Troyer after he was relieved as the Office of Naval Research (ONR) Global commanding officer by Capt. Kevin Quarderer, left, during a change of command ceremony held at ONR. ONR Global provides worldwide science & technology-based solutions for current and future naval challenges.

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