U.S. AIR FORCE ACADEMY, Colo.-- Doctor (Lt. Col.) Leon Barringer, a Reservist Public Health officer with the 446th Aeromedical Staging Squadron, McChord Air Force Base, Wash., and currently a USAFA instructor of biology, works with and guides cadets through a biology lab here Sept. 4. Colonel Barringer is the first Reservist to teach biology at the Academy. (U.S. Air Force photo/Michael Kaplan)
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