OPEN AIR TESTS. “Carroll Island was used as a testing location for open air static testing of chemical weapons since the 1950s … from July 1, 1964 to December 31, 1971 nearly 6-1/2 tons of chemicals were disseminated on the test area including 4,600 pounds of irritants, 655 pounds of anticholinesterase compounds such as the nerve gasses Sarin and VX, and 263 pounds of incapacitants such as LSD. Simulant agents, incendiaries, decontaminating compounds, signaling and screening smokes, mustard, and herbicides were also released as well as riot control gasses.”
http://en.wikipedia.org/wiki/Aberdeen_Proving_Ground