You can have Hueys or Mi-8s fly to a forward base, pick up troops, then fly to an enemy-held city for an air assault. Ka-50s provide escort and AA defense. A-10s provide CAS. Friendly ground troops act as JTACs, designating targets with laser or smoke. Infantry advances and fights enemy infantry, mortars fire at spotted enemy concentrations, stinger teams provide AA defense, Medevac script for downed airmen etc...
I have lots of fun in such coop missions with DCS.
"...late afternoon the Air Tasking Order came in [and] we found the A-10 part and we said, "We are going where!? We are doing what!?"
Capt. Todd Sheehy, Hog pilot, on receiving orders during Operation Desert Storm