Mustard gas-filled 105mm projectiles are seen inside a chemical storage igloo, at the Pueblo Chemical...
Mustard gas-filled 105mm projectiles are seen inside a chemical storage igloo, at the Pueblo Chemical Depot in an undated photo provided by the U.S. Army Chemical Materials Activity (CMA) in Pueblo, Colorado. The destruction of 2,600 tons of World War Two-era mustard agent weapons banned by international treaty began on March 18, 2015 at a U.S. Army depot in southern Colorado, officials said. REUTERS/U.S. Army Chemical Materials Activity/handout via Reuters (UNITED STATES - Tags: MILITARY SCIENCE TECHNOLOGY)