Oscar-winning documentarian, Alex Gibney, will direct the dramatic feature "American Hero".
The movie is based on the true story of US Army Captain Hugh Thompson, who defied orders and saved a number of civilian lives during the Vietnam War's infamous My Lai massacre. Thompson was eventually awarded the Soldier's Medal, the highest medal for bravery not involving direct conflict.
According to The Hollywood Reporter, the project marks Gibney's second narrative film following the political thriller, "The Action", which was announced last year.
Oscar-nominated screenwriter Anthony McCarten is writing the original screenplay for "American Hero".
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