"The Deer Hunter" follows the tragic trajectory of three friends whose lives are irrevocably shattered by the Vietnam War. After being captured by the Viet Cong, Michael, Nick, and Steven are forced to play Russian roulette. Michael's sharp thinking allows them to turn the tables on their captors and escape. During the chaotic helicopter rescue, Steven falls and his legs are shattered, while Nick is rescued but becomes separated from Michael.
Back in the U.S., Michael discovers Steven at a VA hospital, having had both legs and an arm amputated. He is ashamed and refuses to go home until Michael forces him to. Michael also learns that Nick is still in Saigon and has been sending large sums of money to Steven. It's revealed that Nick, deeply traumatized and addicted to drugs, never left the city and has become a professional player in the underground Russian roulette dens.
Haunted by his promise not to abandon his friend, Michael returns to Saigon during its chaotic fall in 1975. He finds a hollowed-out, barely recognizable Nick who fails to recognize him. In a final, desperate attempt to reach him, Michael enters a game of Russian roulette against Nick. He pleads with Nick, trying to jog his memory with visions of home and their hunting trips. For a fleeting moment, Nick seems to remember, smiles faintly, and says "one shot." He then puts the gun to his own head, pulls the trigger, and dies. The hidden meaning is that Nick, in his last moment of clarity, embraces Michael's old code but applies it to his own self-destruction, choosing a definitive end to his suffering. Michael brings Nick's body home. The film concludes with Nick's funeral and the surviving friends gathered in a bar, somberly singing "God Bless America" as they eat breakfast, a funereal rite for their lost friend and their own lost innocence.