SIERRA VISTA — Parts of Cochise County will be used for a major Air Force exercise later this month, Davis-Monthan Air Force Base’s Angel Thunder 2010. Southern Arizona’s terrain lends itself to meeting the goals of the exercise, which will bring in personnel from a number of nations, Staff Sgt. Jacob Richmond said. Along with American forces, others involved in the event will be coming from Brazil, Canada, Chile, Colombia, Denmark, France, Germany, the Netherlands and the United Kingdom, said Richmond of the Davis-Monthan 355th Fighter Wing Public Affairs Office. Additionally, a number of different aircraft, from fixed winged to...