Which is odd in Greyfields case, considering he usually boards Battleships and Waylon airplanes. Though I love how the COZ reflects their personalities. While Greyfield and Waylon love sea and air respectively, they focus on defense the most because they don't want to die. Whereas Brenner has a defensive boost also but its the largest one, and he heals his troops. Though to be fair, CO's weren't apart of the campaign mode until late. So until they were introduced in the battles, they couldn't really die.