SOLAR SWITCH U.S. Air Force Staff Sgt. Stewart Raring removes a solar pathfinder from a snow machine at a remote operating facility in the Pacific Alaska Range Complex on Eielson Air Force Base, Alaska, Dec. 16, 2008. The solar pathfinder measures the intensity of sunlight for an entire year to evaluate the going-green method of using solar panels to operate the snow machine instead of the propane currently in use. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 193944-H-EGT22-723.jpg Photo Gallery