It's a line of The Big Bang Theroy
Pursuant to starfleet general order 104 section a, You are deemed unfit and I hereby relieve you of your command.
The main meaning is "relieve you" or "relieve your command"?
What is "you of your command"?
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To relieve someone of something is to release them from their duty.
In that context, command can refer to a position of highest (military authority).
So it means the person is fired from his job/position.