To meet its obligations under the 1997 Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction, the United States is set to restart the destruction of its chemical weapons in March. According to the Pueblo Chemical Agent-Destruction Pilot Plant in Colorado, a facility built to destroy chemical weapons, there are “2611 tons of mustard agent in artillery projectiles and mortar rounds stored at the U.S Army Pueblo Chemical Depot that will be safely destroyed. After the chemical weapons have been eliminated, the plant will be closed in an environmentally responsible manner.” The United States is among four countries—Russia, Libya and Iraq, being the other three—that missed the 2012 deadline for the destruction of chemical weapons set by the Convention.