since we're talking about ways you can make sides shoot each other i thought id add a little something i found out the other day:
make an empty truck and fill the "cargo" with eastern soldiers using "this moveincargo truck"
make the driver a western person using "this moveindriver truck"
then position a T80 nearby and set the player as any role in the tank except commander
have loads of M-2 machine guns around (or some other destructive devices ;D) which are set to never fire until the truck is blown up
start the mission and
A)if you are the gunner you will be told to shoot the truck (thus killing your soviet buds) - do so
B)if you are driver then your gunner will shoot the truck
when the truck and passengers are messed up get out of your tank and you will notice something strange:
PEOPLE ON YOUR OWN SIDE TURN ON YOU AND MAKE YOU DEAD!!!
ok, so realistically it makes a bit of sense but it seems a bit funny that you get shot for following orders
so there you go....
enjoy