View from the Citadel Ramparts in Copenhagen by Moonlight, Martinus Rørbye https://www.rawpixel.com/image/9087375/image-danish-artist-dahl-denmarkFree Image from public domain licenseA Danish soldier rushes an objective during a live-fire exercise at the Joint Multinational Training Command's Grafenwoehr… https://www.rawpixel.com/image/8727734/photo-image-plant-tree-public-domainFree Image from public domain licenseU.S. Army Sgt. K.C. Pless, a Cortland, New York native and combat medic with the 82nd Brigade Engineer Battalion, 2nd… https://www.rawpixel.com/image/8741385/photo-image-public-domain-peopleFree Image from public domain license