Euroworldnetworks Yun2k

So, im setting up a SP mission. Out of complete randomness the AI decided to shoot at my jeeps with their RPG. i found that so dope so I wanted to have that in the mission but it just wont replicate. I tried setting a Destroy waypoint on the vehicle - AI does nothing, just walks there. I tried setting them to open fire and combat state and just let them stand around (which was basiclly the same that happened when it randomly worked) but they wont shoot at it.... so what am I supposed to do to make this horrendous AI work the way i want? shouldnt it be self explenatory to enable the AI to shoot rockets at vehicles?!?!