Marine Lt. Col. John Ennis, Air Test and Evaluation Squadron 21 (HX-21) chief test pilot, signs paperwork Dec. 19, 2017, at Wright-Patterson Air Force Base, Ohio, transferring ownership of a Marine MV-22 Osprey to Naval Medical Research Unit-Dayton. Lt. Cmdr. Matthew Doubrava, Naval Medical Research Unit-Dayton senior medical officer, stands by to accept the plane which will be used for military aerospace medical research. ( Air Force

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