Tech. Sgt. Matthew Warren (center), an instructor at Sheppard Air Force Base, Texas, instructs Chilean air force maintenance students Senior Airmen Oscar Molina and Jorge Hernandez on the maintenance of the KC-135E Feb. 5, 2010. Thirty-eight maintainers from the Chilean air force received 96 hours of instruction before returning home. (U.S. Air Force photo/Airman 1st Class Valerie Hosea)