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https://www.vox.com/world-politics/23896221/chemical-weapons-united-states-cwc-arms-control-pueblo-blue-grass
This summer, on July 7, at the Blue Grass Chemical Agent-Destruction Pilot Plant in Kentucky, the last M55 rocket, filled with GB, was dismantled. With it went the entirety of the US’s declared chemical munitions stockpile.
At least that's what you've been told.