Ok, playing GRAW2 and I am in the link up mission. The tank appears and I am trying to get my team member whom I gave the rocket to to shoot at the tank. So far all he has done is run out in the middle of the street and shoot at the tank with his rifle. In GRAW I always carried the rocket but decided to finally let a team member do it in this mission. So what is the secret? Of course, the manual said NOTHING about it.

look at the top of this forum, there's a link to the graw forum...
I wouldn't know haven't played Sp yet

I got a team member to take out the tank. After choosing the member, I called up the "orders" menu, scrolled up to attack, put the cursor on the tank and hit F10. I don't have a mouse with a wheel so I use the "F" keys to control team members. Once you've designated the tank (a white dot appears in the horizontal diamond on the tank if you've accomplished this), the team member "should" go out with the Zeus and take out the tank...assuming that you protect him from getting whacked by the enemy forces.