It's a movie with a strong script and well-developed characters, though it does tend to push things too far and shares the same anti-war sentiment found in almost every film about Vietnam. The Vietnam War was among the most violent conflicts the US experienced during the 20th century, and also one of the first that resulted in defeat for Americans. After the Japanese were driven out and French colonial rule ended, attempts to support democratic South Vietnam against an invasion from its northern neighbor—a proxy controlled by the USSR—led to a horrific loss of life that has left a lasting impact on American consciousness. Consequently, numerous films have been made about this war, and most are highly critical of US involvement. This film is just another addition to that group, presenting a story not significantly different from those seen in “Apocalypse Now” or “Full Metal Jacket.” Charlie Sheen delivers what might be considered his finest performance. Beyond looking appropriately unprepared, like an average young man thrown into a war he’s ill-equipped for, he provides a compelling dramatic portrayal and gives the character a believable psychological arc. However, the film also benefits from the presence of two other excellent actors, Tom Berenger and Willem Dafoe, who both have memorable roles. They portray characters with opposing viewpoints whose conflict nearly undermines the operational effectiveness of their unit. Forrest Whitaker, Keith David, and a very young Johnny Depp are also in the cast. Technically, the film excels in many areas. Skillfully directed by Oliver Stone—a work among his most intense and consistent—the movie was filmed on location and manages to convey all the realism and tension one would expect from a war film. The second half is particularly brutal, featuring very graphic combat scenes, considerable bloodshed, and content unsuitable for sensitive viewers. I’d even suggest it's not appropriate viewing for anyone who has experienced combat and suffers from psychological trauma. The cinematography creates a deeply atmospheric feel, using light, cloudiness, fog, and vegetation in creative ways, along with intelligent framing. The soundtrack includes several evocative musical pieces, notably Samuel Barber's Adagio, one of the most moving melodies in classical music. The script also has many strengths. Despite all the violence and the common messages about the senselessness and inhumanity of war that are typical of Vietnam films, a plot involving a bloody rivalry develops between two sergeants from the same platoon: one is a leader determined to complete the mission without resorting to unjustified brutality; the other is a hardened veteran who doesn’t hesitate to kill indiscriminately. Predictably, things become untenable and soldiers' loyalties are divided—a situation that would be unacceptable in any military unit. It’s good to see this element, as the rivalry adds depth to the film, even if it seems far-fetched given how much the military values obedience and the chain of command. Additionally, the film also explores drug use as a means of escaping reality. While this did occur—and was not uncommon practice in giving soldiers substances to help them endure combat—the movie feels like it goes too far. Oliver Stone exaggerates his depiction, which isn't surprising given the kinds of films he has directed.

Source on TMDB