"spam in a can," - Chuck Yeager's famous remark which is why he didn't become an astronaut.
"Eventually they were able to get the Mercury design modified enough to allow the astronaut inside to be able to control the orientation of the capsule with attitude jets - powered by hydrogen peroxide, if I remember correctly."
Believe they added a manual mode to supplement the ground control, which was in place for the first manned Mercury mission by Alan Shepard.
Still used in some satellites.
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