https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/4224899Edit ImageSaveSaveEditCropCustom TextAlaska 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 FlickrMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGBanner JPEG 1200 x 799 px | 300 dpiLarge JPEG 3500 x 2330 px | 300 dpiBest Quality JPEG 4247 x 2827 px | 300 dpiFree DownloadAlaska 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 FlickrMore