Having a little problem...

[Zeroth]

first day back and i used to be able to do this: if you have played most RPG maps, you've probably noticed that they have patrolling units that respawn when their numbers go too low.... well, i've been able to do this before, but now i forgot how to do this can someone please post the triggers required? thanks in advance.

 

[Lwek]

Conditions
-Player 8 commands(or bring) atmost 3 marine
Actions
-Create 10 marines
-Preserve Trigger