HOLLOMAN AIR FORCE BASE, N.M. -- Chief Master Sgt. Harold Clark, 12th Air Force command chief, watches as Capt. Joshua Higgins practices the anti-gravity straining maneuvers inside a centrifuge at the Physiological Training Center April 6, 2010. Master Sgt. Gregory Flores lectures Capt. Higgins on isometric muscle contractions that train Aircrew on the effects of high anti-gravity straining maneuvers. (U.S. Air Force photo by Airman 1st Class Veronica Stamps / Released)
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