Floyd C. Gale, Someone to Watch Over Me
“ However, crewmen couldn't be drugged. They had to be awake to tend the ship. The credo of the Space Service was that you couldn't trust a machine to itself any more than you could trust an extraterrestrial, a non-human. If a man wasn't in charge, ultimately everything would go to pot. That was part of the space tradition, like the primitive axes that hung on the bulkheads, so a man could smash his way to the modern fire-fighting equipment. ”
