I saw bits of a black and white Cold War themed movie – NOT – Dr. Strangelove or Failsafe….
The film ends with an Air Force officer realizing the signal to launch was a mistake and he has to disarm a missile as it’s about to launch. He rides up a cherry picker type basket to open a hatch and disconnect some wires. He knows that he’ll be exposed to lethal radiation and he dies there when he’s done.