WRIGHT-PATTERSON AFB, Ohio, April 27 -- The U.S. Air Force issued the following news: By Jason Schaap Air Force Research Laboratory Public Affairs There's only one place to find them in all the Department of Defense, and that's at the Air Force Research Laboratory. Three of the lab's Research Altitude Chambers, better known as the RACs, are now certified for manned research up to 50,000 feet. No other chambers in the DoD have the same man-rating certification. It's a feat not easily found el  more