The Wookiee honor code was a rule in Wookiee culture which forbade Wookiees from using their extendable claws for anything other than climbing. In 34 ABY, Chewbacca, a Wookiee from Kashyyyk, broke the code when he furiously used his claws to kill a First Order stormtrooper after Kylo Ren killed Han Solo, Ren's father and Chewbacca's friend. Even though Chewbacca knowingly violated the Wookiee honor code, he rationalized that there was no honor among the First Order and that Ren had broken all of the rules when he killed Solo.