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Alaska Air National Guard Airman 1st Class Mac Spurlock, an aerospace propulsion mechanic assigned to the 176th Maintenance Squadron, inspects a HC-130 Hercules engine at Joint Base Elmendorf-Richardson, Alaska, Nov. 16, 2016. The HC-130 Hercules is undergoing an isochronal inspection to ensure the aircraft is safe and remains mission ready. (U.S. Air Force photo/Alejandro Pena). Original public domain image from Flickr

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Alaska Air National Guard Airman 1st Class Mac Spurlock, an aerospace propulsion mechanic assigned to the 176th Maintenance Squadron, inspects a HC-130 Hercules engine at Joint Base Elmendorf-Richardson, Alaska, Nov. 16, 2016. The HC-130 Hercules is undergoing an isochronal inspection to ensure the aircraft is safe and remains mission ready. (U.S. Air Force photo/Alejandro Pena). Original public domain image from Flickr

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