The professionals at the Brooks City Air Force Research Lab in San Antonio, Texas, are experts on the forces caused by acceleration, also called "G forces." That's what people feel in their stomachs when riding a wild roller coaster. But at Brooks City, they specialize in the more powerful forces experienced by fighter pilots. Training in a human centrifuge under the guidance of people like SSgt. Andre Scott, an aerospace physiology craftsman, the pilots wear custom clothing and learn techniques to handle High G environments. They are taught to safely fly their aircraft to 9 Gs, far past the 4-6 G point where the average person would pass out.