Staff Sgt. Stephanie Smith adjusts the controls on a portable air conditioning unit. U.S. Air Force Staff Sgt. Stephanie Smith adjusts the controls on a portable air conditioning unit used to cool the interior of KC-135 Stratotanker aircraft in the extreme desert heat of Nellis Air Force Base, Nev., during exercise Red Flag 07-3 on Aug. 21, 2007. Smith is a communications and navigations specialist with the 100th Air Refueling Wing out of Royal Air Force Mildenhall, England. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 591194-E-ZAN64-334.jpg Photo Gallery