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In page Edgewood Arsenal human experiments:

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Much of the experimentation at Edgewood Arsenal surrounded the modulation of acetylcholine or acetylcholinesterase, or the deactivation and reactivation of substances which did the same.[1] These experiments represented a significant enough proportion of the total experimentation to earn a dedicated volume in the main experimental documentation. Much of the follow up data on the acetylcholine related experiments are lacking or entirely missing, due to a combination of remaining classification and failures on the part of the United States Department of Veterans Affairs and United States Department of Defense to follow the subjects of the experimentation.[2][citation needed]