"First to Fight." A group of U.S. Marines. US Marine Corps Recruiting Publicity Bureau., 1918. Original public domain image… https://www.rawpixel.com/image/8799895/photo-image-vintage-airplane-public-domainFree Image from public domain licenseLieutenant Earl Carroll, prominent composer, is now a full-fledged aviator in the U.S. Service. He is shown beside his fast… https://www.rawpixel.com/image/8769906/photo-image-face-vintage-airplaneFree Image from public domain licenseDischarge of a huge French cannon caught by the camera just as the projectile left for the German lines. The gunners have… https://www.rawpixel.com/image/8799766/photo-image-vintage-airplane-public-domainFree Image from public domain licenseManufacturing airplanes for the government by Dayton-Wright Airplane Company. Completed plane on exhibition. Plant-1.… https://www.rawpixel.com/image/8802618/photo-image-person-airplane-vintageFree Image from public domain license