A milestone in the history of warfare dating back to World War I is about to be reached as the United States prepares to destroy the last of its declared chemical weapons stockpile. Workers at the Blue Grass Army Depot in Kentucky are close to eliminating the last of thousands of rockets filled with sarin nerve gas that have been stored there since the 1940s. It's a watershed moment for the nation's decades-long effort to meet a September deadline for destroying weapons under the international Chemical Weapons Convention. Another Army site in Colorado completed destruction of its stockpile last month. Arms control advocates say they hope the ambitious project will be a model for ending stockpiles of other weapons.
