U.S. Is Destroying the Last of Its Once-Vast Chemical Weapons Arsenal

PUEBLO, Colo. — In a sealed room behind a gantlet of armed guards and three rows of high barbed wire at the Army’s Pueblo Chemical Depot in Colorado, a team of robotic arms was busily disassembling some of the last of the United States’ vast and ghastly stockpile of chemical weapons. In went artillery shells filled with deadly mustard agent that the Army had been storing for more than 70 years. The bright yellow robots pierced, drained and washed each shell, then baked it at 1,500 degrees Fahren