Compliance under a 1997 international treaty banning all chemical weapons slowed by dent in containment facility... Army Halts Chemical Weapons Destruction in Colorado Sep 25, 2015 -- The Army has temporarily halted the destruction of chemical weapons at a Colorado facility to repair a small dent in the door of a chamber used to blow up shells containing mustard agent. See also: McCain: How Did Military Bomb End up in Scrap Yard, Killing Worker? Sep 25, 2015 -- U.S. Sen. John McCain wants the Department of Defense to explain how a 500-pound military bomb wound up in a scrap yard, where it partially exploded and killed an employee trying to cut into it.