Ironhorse is right on.

During an out-brief with my last group CO, we talked about how vital the MAW was. He cited a figure that something like 85% of all the combat power of the MEF was carried by the wing. I'm not sure how he calculated that number, but when you take a firepower-centric view of the world, it's probably correct.

Nonetheless, the MAW is always in support of ground ops. During MEU ops, the BLT or the MSPF/MARSOC Company will pretty much always be the mission commanders, with the ACE in support. Same goes for more convetional ops. Close Air Support isn't CAS without GCE involvement.