EXHAUSTED U.S. Air Force Staff Sgt. Charles Sparks inspects the exhaust of an F-15E Strike Eagle at Nellis Air Force Base, Nev., April 9, 2008. Sparks is assigned to the 391st Aircraft Maintenance Unit at Mountain Home Air Force Base, Idaho. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 508044-P-ZOK87-260.jpg Photo Gallery