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A final push to rid the United States of the last of its chemical weapons is underway at an Army depot in Pueblo. It involves the use of static detonation chambers, a form of incineration.

The Army says it has reached a milestone at a Colorado chemical weapons depot by destroying nearly 300,000 decades-old artillery shells containing mustard agent.

An Army depot in Pueblo has long been home to a toxic legacy: hundreds of thousands of chemical weapons. They've been stockpiled there for generations, and they must be destroyed according to an international treaty. Environmental concerns have delayed the effort, but now, the weapons are finally disappearing.