ABERDEEN PROVING GROUND. “From 1955 to 1975, the U.S. Army Chemical Corps conducted classified medical studies at Edgewood Arsenal, Maryland. The purpose was to evaluate the impact of low-dose chemical warfare agents on military personnel and to test protective clothing and pharmaceuticals. About 7,000 soldiers took part in these experiments that involved exposures to more than 250 different chemicals … long-term follow-up was not planned as part of the DoD studies.”
http://en.wikipedia.org/wiki/Aberdeen_Proving_Ground