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"?
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.