U.S. Air Force 1st Lt. Andrew Johnson, a 20th Bomb Squadron navigator, conducts a preflight inspection on a B-52H… https://www.rawpixel.com/image/8742482/photo-image-public-domain-person-redFree Image from public domain licenseU.S. Air Force Staff Sgt. Jacob Tumbleson, 2nd Aircraft Maintenance Squadron, 20th Aircraft Maintenance Unit crew chief… https://www.rawpixel.com/image/8727874/photo-image-airplane-public-domain-personFree Image from public domain license