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On April 18th, 2012, twenty B-25 Mitchell bombers gathered together for the largest formation flight of B-25s since WWII. Thundering over the National Museum of the U.S. Air Force, these twenty bombers and their crews paid homage to the last surviving American heroes of the Doolittle Raid. This video was taken by crew members of Historic Flight Foundation's B-25D 'Grumpy' both on the ground and in the air during this historic event.