I did this for my launcher replacement pack. On a side note. The RPG soldiers do a pretty good job of manhandling the heavies (MI17, CH47, or BAS' MH47) However I've never been shot down or seen a Kiowa shot down in action, AH1/64's also don't seem to be easy targets usually for RPG soldiers. Usually the max velocity I see them getting semi reliable hits is around 130km/h, at an intermediate distance, anything past that speed and distance and it really has to be a big chopper other wise they miss.
This can however be a problem if you want a mission where ai soldiers fight armor, since they will get distracted by any air vehicles in the area. Personally I'd love to see a fire control script for officers to get them to safety their secondary weapons until the time is right.