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Then, U.S. Air Force 1st Lt. John Marks in an A-10 Thunderbolt II in 1991 next to, now, Lt. Col. Marks in the cockpit of an A-10 at Whiteman Air Force Base, Mo., Nov. 14, 2016. Marks reached 6,000 hours in an A-10 after flying for nearly three decades. (Courtesy photo provided by Lt. Col. Marks)
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