I can never seem to UNlink my guys. Once in a while I can. If you hold the flag of the linked platoon over the platoon they are following, and hold down on the action button, you should get an Unlink option, right? I only get the unlink option 1% of the time. heh.
I can't unlink them either. I tried that, but I've lost my BW2 instruction booklet somewhere and I can't think of a place to look online that'd have basics like that... so I don't even know if I'm doing it right XD
I linked platoon #4 to platoon #3 and #3 got the eagle on top. I unlinked them by grabbing the flag of platoon #4 and holding it away from platoon #3 and pressing the action button.