I’d say this feels like the ultimate film about the Vietnam War. Martin Sheen portrays “Capt. Willard,” an exhausted soldier tasked with a covert assignment: locating and neutralizing Colonel 'Kurtz" (Marlon Brando), who's acting on his own in Cambodia. Accompanied by a small group of inexperienced soldiers, he begins traveling up the perilous Nung River, encountering "Kilgore" (Robert Duvall) along the way, and confronting numerous threats from both enemies and the environment while pursuing their target. The unrelenting pressure of this journey and the obstacles it presents lead “Willard” to reconsider his views, extending beyond just the war itself, as the conflict’s brutality unfolds before him. It's a remarkably powerful portrayal of warfare; showcasing the humanity and fragility of the characters—even those who appear tough—and featuring inspired casting choices. There are moments of violence and bloodshed, but they don’t feel excessive, and Brando’s closely cropped hair contributes to his exceptional performance as the power-hungry "Kurtz." Although the story is made up, it doesn't shy away from difficult truths, leaving viewers with a sense of unease and some genuinely complex questions.

Source on TMDB