Abstract
Details about the US biological programme have largely been based on information in the open literature. More revealing aspects of the programme are now available through documents released under the Freedom of Information Act. Annual reports of the activities of the US Army Chemical Corps from 1945 to 1959 have revealed significant increases in activity in biological warfare research. The Corps research activity progressed from work on anthrax in 1941, through anti‐crop agents in the mid‐1940s, to a wider range of animal, plant and human diseases by 1960. A number of disease organisms were investigated sufficiently to permit some standardisation and manufacture of munitions.

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