During the Vietnam War, each soldier took roughly 40 amphetamine tablets

Interesting History Fact: 

During the Vietnam War, each soldier took roughly 40 amphetamine tablets a year in order to improve their endurance on long missions. Nearly 225 million tablets were prescribed to soldiers during the wartime period of 1966 and 1969 alone. - WTF Fun Facts 

Source: https://www.history.com/news/drug-use-in-vietnam

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