runningdeer (cool name, i prefer stationary ones myself, easier to shoot:p )
its pretty simple, you just pop it in last, and there you go
now, i experienced a problem on my game that might be on yours.
when i tried starting a new campaign, it kept poping up out of game saying its missing a line in the data/submarine/NSS_688i/NSS_688i.upc file
and in the data/upcfiles(i think, it has upc in it i know that/UnitParts/106881.upc
the sub came without a lightmap, so, if it does this, i will create a fix for it, if anyone is having trouble doing it.