On July 20, 2022, the Pueblo Chemical Agent-Destruction Pilot Plant destroyed the last munition of the 105mm projectile campaign. Initially, more than 383,000 105mm projectiles were safely stored at the Pueblo Chemical Depot. These munitions made up approximately 49% of the U.S. chemical weapons stockpile located in Colorado. Each munition contained approximately three pounds of mustard agent. Nearly 600 U.S. tons of mustard agent have been destroyed during this campaign.