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I normally run a CAD, but I wanted to make sure this could be used alongside a CAD. Specifically, I want to run a RW Support Squadron or an Attack Squadron Formation, but I just want to make sure I can run it without having to take a Battle Demi-Company.

http://1d4chan.org/wiki/Warhammer_40,000/Tactics/Dark_Angels(7E)#Formations_and_Unique_Detachments

You can take any number of detachments.

Formations are detachments

Excellent. The Lion's Blade (Gladius Strike Force, essentially) is interesting, but I really don't want to field some of the requireds, so I'm making sure I can still take some cool Ravenwing Formations.