As detailed in the clip from the documentary Heart of Darkness: A Filmmaker’s Apocalypse, the original screenplay for the movie was written during the middle of the Vietnam War making it a leading example of a primary source for the war. Although the movie cannot be used as a source for the events that occurred during the war, it can be used as a source for how the American public viewed the war. The depiction of the gruesome and maddening nature of war reveals how anti-war the creators of the movie were. The loss of the protagonist’s grip on reality and spiral into darkness can be seen as a metaphor for America’s involvement in the war. The longer the U.S. is in the conflict the more the public loses faith in the ability and judgment of the government. Overall, the movie expresses the disillusionment that the American public felt while the U.S. was fighting in the Vietnam conflict.