Question: Who trained as a test pilot in the United States, Roberto Vittori or Philippe Perrin?
Sentence (from "Boone Guyton"): In a flying career spanning the biplane era through the jet age, Guyton was perhaps best known for his test pilot years at Vought-Sikorsky (Chance Vought) and his participation in the development of the F4U Corsair and various other military aircraft including the OS2U Kingfisher and the radical Vought V-173 flying pancake.
Relevant evidence: No