The residents of Ho Chi Minh City face modernization amid widespread poverty. A retired American Marine arrives on a search for his daughter, whom he abandoned at the end of the Vietnam War. Elsewhere, a cyclo driver falls for a troubled prostitute and schemes to raise money so he can spend time with her. Additionally, a young women begins harvesting lotuses for a writer suffering from leprosy, and a child trinket seller loses his traveling case.

The year is 1965 and America is at war with North Vietnam. Commanding the air cavalry is Lt. Col. Hal Moore (Gibson), a born leader committed to his troops. His target: the Ia Drang Valley, called "The Valley of Death." As Moore prepares for one of the most violent battles in U.S. history, he delivers a stirring promise to his soldiers and their families: "I will leave no man behind...dead or alive. We will all come home together."