on Project Mercury. The officials conceded that it would be a hazardous undertaking, but emphasized that it was of great national importance. The candidates were given three briefings by NASA officials. The first was about NASA and Project Mercury; the second concerned the role of the pilot in the project; and the third was about the proposed astronaut training syllabus. In the afternoon candidates had short individual meetings with the NASA selection committee. It was emphasized that participation was entirely voluntary, that candidates were free to decline, and that there would be no career repercussions if they did so. Several candidates declined at this point. The rest reported to NASA Headquarters in Washington, DC, the following day for further screening. Voas gave them a series of standardized tests: the Miller Analogies Test to measure IQ; the Minnesota Engineering Analogies Test to measure engineering aptitude; and the Doppelt Mathematical Reasoning Test to measure mathematical aptitude. Donlan, North and Gamble conducted interviews in which they asked technical questions, and queried candidates about their motivations for applying to the program. Candidates were evaluated by two USAF psychiatrists, George E. Ruff and Edwin Z. Levy. A USAF flight surgeon, William S. Augerson, went over the candidates' medical records. Some were found to be over the height limit, and were eliminated at this juncture. The process was repeated with a second group of 34 candidates a week later. Of the 69, six were found to be over the height limit, 15 were eliminated for other reasons, and 16 declined. This left NASA with 32 candidates: 15 from the Navy, 15 from the Air Force and two from the Marine Corps. Since this was more than expected, NASA decided not to bother with the remaining 41 candidates, as 32 candidates seemed a more than adequate number from which to select 12 astronauts as planned. The degree of interest also indicated that far fewer would drop out during training than anticipated, which would result in training astronauts who would not be required to fly Project Mercury missions. It was therefore decided to cut the number of astronauts selected to just six. Then came a grueling series of physical and psychological tests at the Lovelace Clinic and the Wright Aerospace Medical Laboratory from January to March, under the direction of Albert H. Schwichtenberg, a retired USAF brigadier general. The tests included spending hours on treadmills and tilt tables,