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Incredible rare footage shows US Army soldiers being dosed with LSD after the volunteers agreed to be part of government-sponsored experiments.
The psychedelic drug leaves the marching troops in laughter and "chaos" as they attempt to take part in a drill, while being shouted at by an officer.
Between 1948 and 1975 the American Army reportedly conducted several experiments using LSD, as well as other drugs, in the hope of using the hallucinogenic substance as a weapon of war.
In this clip, which has re-emerged online, a test is being carried out at Edgewood Arsenal Facility, in Maryland in 1958.