U.S. Air Force 1st Lt. Christopher Reith, a pilot with the 37th Airlift Squadron, completes his pre-flight checks on a C… https://www.rawpixel.com/image/8739210/photo-image-public-domain-headphones-personFree Image from public domain licenseA Romanian air force paratrooper lands on a dropzone at Boboc Air Base, Romania, Aug. 23, 2018. https://www.rawpixel.com/image/8741691/photo-image-public-domain-personFree Image from public domain license