[narwan]

Question:
if all flags are within reach of the player (have to be in order for the player have a choice at all) what will keep him from moving a unit (of which he'll have plenty) to each of the flags?

This could work though but as far as I can tell, only if the player has exactly one unit (no more, no less) that could reach these flags. So if he has received helo's as part of his core force at any previous point in the campaign, this 'trick' won't work. That would mean keeping helo's AUX all the time.