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All the sentient robots in my collection were either workers or patients at a M*A*S*H unit on a backwater planet during the galactic war against the fleshies.
They often played pranks on each other to distract from the horrors of war.
The nonsensical rules of war sometimes meant that the robot doctors would have to save the life of a fleshie prisoner (usually a GI Joe figure), only to see it executed later on a hill near the unit.