SHAW AIR FORCE BASE, S.C. -- Airman 1st Class Melissa Trevino, 20th Aerospace Dental Squadron aerospace physiology technician, shows Andrew Bushell, Australian Rotarian member, an oxygen mask used in aircraft. Mr. Bushell visited Shaw as part of a five-week Rotary International tour and was sponsored by the City of Sumter Rotary clubs. (U.S. Air Force photo/Kimberly Champagne)