Shifter
Clone Trooper
posted 04-25-15 03:07 PM
EDT (US)
633 / 1043
Due to Palpatine stating in Revenge Of The Sith, "Commander Cody...the time has come. Execute order 66".
I always assumed that the clones knew what Palpatine had planned from the very beginning making it possible for them to refuse the order if they so chose to do so.
The movies themselves really didn't reveal it to be anything else.