The average cost of training a combat jet pilot is over US$800,000 ( Dolgin et al., 1987), and based on costs alone, no country can afford to lose such an investment. Air forces of the North Atlantic Treaty Organization (NATO), including the USAF, have developed programs involving centrifuge training to combat this problem. Intensive periodic human centrifuge training, similar to the hypoxia-recognition test in a hypobaric chamber, is recom-mended not only for high-performance aircraft pilots, but also for any pilot who performs aerobatics. The training enables pilots to recognize, in a controlled and safe environment, the consciousness cut-out point experienced when undergoing þGz maneuvers. Personnel can be trained to tolerate high-G loads for prolonged periods (9-G for up to 45 s) with exposure to these forces in