CaptainSergeantTrain

I've been making my own Missions for awhile now, and the only thing that really gets to me is the fact that I can't figure out how to change the Units that are Pilot/Co-Pilot/Ect. seat(s). In other words, is there a script I can use to, for example, to make it possible to have a Russian Rifleman (Or a Custom Unit, for that matter) as the Pilot of a A-10 at the start of a Mission? Thank you in advance for your help.