Camp of tents by the lake at night in Vietnam. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3289261/free-photo-image-cave-adventure-animalFree Image from public domain licenseA U.S. Marine fires an AK-47 rifle during night-fire sustainment training in Helmand province, Afghanistan, March 28, 2013. https://www.rawpixel.com/image/3318577/free-photo-image-afghanistan-beach-cc0Free Image from public domain license