Tim O’Brien was sent to Vietnam as a foot soldier in 1969, during the later part of the Vietnam War that can be called the “bad” or unwinnable war. Based on his experience, O'Brien's writing about the Vietnam War in his award-winning fiction novels is always "bad," meaning that the war was terrible for American grunts like himself, his fellow soldiers, and Vietnamese civilians, with practically no good or inspiring stories. Nevertheless, O’Brien touches upon almost all problems of American soldiers in the Vietnam War, but not many peer-reviewed authors or online literary analysis websites could identify or discuss them all. The purpose of this article is to discuss the war details in O’Brien’s The Things They Carried and its historical perspective, so that young middle and high school readers can understand the meaning behind Tim O'Brien's writing about the Vietnam War. The goal is to summarize the entire big picture of the Vietnam War and to help students determine whether American soldiers’ actions, as described by Tim O’Brien, were morally right or wrong and were legal or forbidden according to the US law of war. The war-related issues that O’Brien mentioned in this novel are: boredom and meaningless death, abusive violence toward Vietnamese noncombatants, drug use, in-fighting, thefts within barracks, grief, rage, self-mutilation, mutilation of enemy corpses, and senseless animal and civilian killings.