this setunitpos "up";this switchmove "combattocrouch"
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i found that this in units init
without a waypoint or a setbehaviour command or a setcombatmode command.
keeps him crouched and not moving if thats what ur looking for.
however as soon as enemies appear he will move ,hit the dirt, or someother action.
as the AI will kick-in, unless you disable the AI as well.
of coarse you can turn all those settings back on with a trigger, until a condition is met.IE. WEST present