S66-42754 (18 July 1966) --- Astronauts John W. Young (leading), command pilot, and Michael Collins, pilot, walk up the ramp at Pad 19 after arriving from the Launch Complex 16 suiting trailer during the prelaunch countdown. Moments later they entered the elevator which took them to the white room and the waiting Gemini-10 spacecraft. Liftoff was at 5:20 p.m. (EST), July 18, 1966.