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NASA research pilot Bill Dana after his fourth free flight (1 glide and 3 powered) in the HL-10. This particular flight reached a maximum speed of Mach 1.45. Dana made a total of nine HL-10 flights (1 glide and 8 powered), and his lifting body experience as a whole included several car tow and 1 air tow flights in the M2-F1; 4 glide and 15 powered flights in the M2-F3; and 2 powered flights in the X-24B. He is wearing a pressure suit for protection against the cockpit depressurizing at high altitudes. The air conditioner box held by the ground crewman provides cool air to prevent overheating.