Brennan Linsley, Associated Press file
In this Jan. 29, 2015, file photo, a remotely controlled robot handles an inert simulated chemical munition during training at the Pueblo Chemical Depot in southern Colorado. 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. 
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This month the world witnessed one of the greatest arms control milestones of our generation.聽 On July 7, we eliminated the United States鈥� last remaining stockpile of chemical weapons.
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