Then one morning Johnny called me to his office. “Bill, we would like you to take a look at the X-3. Maybe you would like to test her. She’s in the final stages over in Hangar Three. Go over and take a look at the mock-up. See what you think. . .” On the ground floor in front of a door marked KEEP OUT. SECRET PROJECT MX656. . . . — The Lonely Sky, by William Bridgeman and Jacqueline Hazard, Cassell and Company Limited, London, 1956, Chapter XXIII at Page 276.