Fog of War
Marines with Special-Purpose Marine Air-Ground Task Force Crisis Response-Africa, form a shield wall at the National Gendarmerie Training Center in St. Astier, France, June 19, 2015. The Marines trained to operate through dense smoke and riot-control gas while maintaining tightly organized formations.
(U.S. Marine Corps photo by 1st Lt. Danielle Dixon/Released). Original public domain image from Flickr