system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Were there any Clone Troopers that refused to execute Order 66?
gpt
In Legends, yes. A large number did.

In canon, we don't know - since Order 66 is hardcoded into an implant in their brains, the only ones we know for sure don't do it are ones who had their chips removed, which we've seen five total do that, one of whom went crazy, another was killed while resisting arrest, and the other three are shown in *Rebels* season two.

Supposedly there was a sub-order to Order 66 that caused clones to fire on their brothers who managed to resist when the programming was initiated.