Tech. Sgt. Zachary Michalski uses a borescope to inspect a turbine. U.S. Air Force Tech. Sgt. Zachary Michalski, with the 164th Expeditionary Air Squadron, 25th Combat Air Battalion, uses a borescope to inspect a turbine on the engine of a C-130 Hercules cargo plane at Contingency Operating Base Speicher, Iraq, on Nov. 11, 2009. SHARE: Download: Full Size (0.02 MB) Credit: VIRIN: 848642-A-VTH01-757.jpg Photo Gallery