Also known as the Galactic Marines, the Nova Corps were an elite unit of Clonetroopers and were frequenlty deployed as the first units to see action in a particular campaign. Commander Bacara was the Clone in charge of them. Jedi General Ki-Adi Mundi liked to work with them because he admired their discipline and was pretty sure they wouldn't kill him. Their final battle with Mundi was the Battle Of Mygeeto, where Bacara was given Order 66. He and the Marines opened fire on Ki-Adi, taking him by surprise and killing him. At least he was able to deflect a couple of shots, unlike some people.