A Marine with the 24th Marine Expeditionary Unit carries cold weather gear on a march across the Icelandic terrain in October 2018, in preparation for NATO Exercise Trident Juncture 2018. Given the warfighter’s need to carry big loads such as this one, any reduction in equipment weight promises to increase mobility, survivability and lethality. The cartridge case is a prime target for weight reduction in small-caliber munitions. (U.S. Air Force photo by Capt. Kylee Ashton, 368th Public Affairs Detachment)