FINAL SPIN Members of the Physiological Training Center conclude 22 years of centrifuge training with its final spin on Holloman Air Force Base, N.M., Oct. 27, 2010. Operated by the U.S. Air Force School of Aerospace Medicine, the centrifuge exposed pilots to a high level of G-forces -- a measurement of an object's acceleration -- which aircrews encounter in high-performance aircraft. Holloman's centrifuge trained nearly 32,000 students. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 993379-R-MDY53-634.jpg Photo Gallery