It'd be great if somehow an RTO Soldier (like in the Seb NAM Pack) actually had support options when you were near him, rather than in your own radio. Perhaps to the similar fashion of the Radio guy in the Vietcong game.
So when you "call" him over (through the action menu?), you have available support options, such as Airstrike, Artillery ect..
Maybe anims could be used, so the player performs the phone pickup animation when near the RTO?