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To attribute Nixon's action to cease bio-weapons production to criticism of Agent Orange is unsupportable in the facts.
A newspaper columnist, John Anderson I believe, published a list of the agents being manufactured at Pine Bluff. By this time, the United States had already signed onto the international ban of biologicals, so that did put some pressure on the Nixon administration.
Nevertheless, no general officer was really interested in the then-current technology of biological weapons. There was simply no evidence of efficacy or efficiency. The Department of Defense did not want to pay for maintaining the biological manufacturing facility or supporting any of the existing stockpile. 
Only a very minimal research organization has continued on the off chance that we may discover something that works someday.

Robert Ferguson
Sewickley, PA