ok. the question is what unit should i use as a anti-tank??
the problem is.
as your cross this area a panzer tank comes out and is going to kill you. but there is a panzer faust right by you and you can run and grab it. but i need so people playing has a chance to run and grab the panzer faust. and another problem is after you kill the tank you can switch back... but you can choose your unit at the first part

so i dont know what unit to create ahhh!!!

If you want to force people into their Tanks, use an Order Trigger and force them to Move. Unless you hyper it, it's pretty easy to fight though.
For unit creation, don't get rid of the player's units once they get into the Tank. Simply move them to a location somewhere that they can't get out of. Once they leave the Tank, center a location on it and move the units back.
If l remember correctly, the tank was behind barbed wires, so you approach in range of the tank, but since it didnt shoot rockets, you should hide a gun turret somewhere. I dont think a unit will match a rocket effect, so l would use a scourge owned by a computer and shoot it over the tank, thus allowing a large explosion.
I played CoD and l know which level your talking about [Dawnville?]
The panzer has 1 rocket, so there is no point to change units, since you have to go back for it, you can just store the default unit on a part of an unused map.
Problem #1 - Well... you could use Tassadar, but he is pretty short ranged and you would have to take away his spells. I can't really think of any others.
Problem #2 -
1 - In another part the map you could have a place where you can choose to revert back to your picked weapon. It could be a civ and a beacon, a building, or a dropship.
2 - Or you could just have another "weapon" (powerup?) close by that says "Revert to Picked Weapon"
3 - Or, you could make it so that the Panzer Faust only has one rocket, so when you kill the tank in one hit you take away it
I like solution #3 best. Hope this helped
problem solved.
#2.see how about this.
Players:
Allies
Condtion:
Player 6 brings at least 0 tanks to Location Tank
Action:
Remove All Panzer Faust at location Anywere for current player
move all units at Weapon Wait to Panzerfaust for current player
__________________________________
ok thats the tank remove trigger.
Panzer Faust Trigger
Players:
Allies
Brings at least 1 unit to panzerfaust
move all units at location Panzerfaust to location weapon wait
create 1 panzerfaust for current Player
________________________________________
Thats should work right?
Can you order you text out a little more with:
Conditions:
(Conditions)
Actions:
(Actions)
That, works for one person, or them all, because it will remove the tank, but the location might still work if preserved.