Hawk

Hawk was the leader of Z-95 Headhunters and part of the 501st during the Clone Wars era. He reappeared in Star Wars: The Last of the Droids helping Palpatine lead the Headhunters against the Droid Interceptors. The reason why Hawk joined, was he was tired of sitting around doing nothing and now since he new the Droids were back, he was ready to fight.