Planes over water

AIR FORCE PHOTOS

Studying human performance

Staff Sgt. Andre Scott assembles a breathing mask used to collect expired gases for comparison to atmospheric gases prior to the arrival of a citrulline malate test subject Aug. 18 at Brooks City-Base, Texas. Sergeant Scott is a aerospace physiology technician with the Air Force Research Laboratory. (U.S. Air Force photo/Steve Thurow)

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