changing all players behaviour

[kdk11 1]

In my mission I would like to be able to place a trigger so that when a vehicle goes through it, it will make all players inside change there behaviour. "groupname" = group this;{ _x setBehaviour "SAFE"; _x setCombatMode "GREEN"} forEach (units this). I know that works if you put it in the squad leaders init. But how can I put something in a trigger that would cause them to switch to this? or what do I have to put inside of the units init etc?