Jack Mcmahon

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In this April 15 photo, Lt. Col. Jack McMahon, top, and Pat Findlay, front, work under the wing of the Vietnam-era C-123 to replace a leaking valve behind the engine in Beaver Falls, Pa. Findlay and McMahon volunteer at least a day or two every week in a large hangar at Beaver County Airport fixing up vintage aircraft at the Air Heritage Museum (Mark Marietta/Observer-Reporter via AP)