Through this walkthrough, some of my units have been upgraded to HQ7, but Leia, who is arguably more important campaign unit, is still HQ6.
Roolan's Wrath - Mission 4 (3 Stars)
http://youtu.be/gx4juuiDEnc
Roolan's Wrath - Mission 5 (3 Stars)
http://youtu.be/XebyZ-ZZXXk
Roolan's Wrath - Mission 6 (3 Stars)
http://youtu.be/Jnr1bnJYyvs