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"Capt. Catercia Isaac checks out the inside of the Mark-1 space chamber Oct. 5, 2009, at Arnold Air Force Base, Tenn. Capt. Issac is a physicist and the flight commander of the 718th Test Squadron. The Mark 1 Test Facility is a state-of-the-art space environment simulation test chamber for full-scale space systems testing." - U.S. Air Force photo/Lance Cheung