In the 1960's and 1970's the US government tested chemical and biological weapons on US troops in still little known secret programs called Projects 112 and SHAD (Shipboard Hazard and Defense). The Vietnam era tests involved some 6,000 military personnel being subject to experiments involving deadly nerve agents like sarin and VX, as well as biological agents like E. Coli, all of which can result in quick death or potential lifelong debilitating health issues such as long-term central nervous system failure.