Right.... have done a bit more research on this.
The AirCav Platoon (M) + AirCav Lift makes up an aero rifle platoon, the ground recon element of an air cav troop.
The AirCav Support (I) and Platoon (I) don't relate to anything I've seen on the net, unless they representmixed/dispersed elements of a cav troop (ie Support (I) could represent scout and gunship elements combined to form a "pink" team)
As far as I have read, an AirCav Troop should consist of:-
1)Aero weapons platoon (11xUH-1/AH-1 gunships)
3xhelos in platoon HQ
2xsections of 4xhelos
2)Aero scout platoon (10xOH-6 scout helos)
2xhelos in platoon HQ
2xsections of 4xhelos
3)Aero rifle platoon
5xUH-1 for transport
45xsoldiers in four ten man squads with a 5 man HQ section
A link to my source of information is below:-
http://www.gruntonline.com/TheWar/aero_rifle.htm