Jacob's Ladder
Jacob Singer is a Vietnam War veteran who is suffering from PTSD. He has bizarre and terrifying visions that can't be explained by doctors. In the movie, we learn that the government gave the soldiers psychedelic drugs to make them more violent.
Acceptance
At the end of the movie, his visions are happier and clearer. Apparently, the only explanation to this is that he accepted death. It kind of felt like a cop out!