Every MIC will belong to a MAC. It's one of his agent. Every player will play as a MAC and will have some MIC under order.
It will have a MAC point system. Each time a MAC will try to perform an action, he will loose some points. The MAC will be secret at the start of the game, as the number of points they have. They will play "under cover" with the gamemaster.
MIC will be "public". They will have "public" adventure, like infiltrate an enemy base, find a xenos artifact, rescue someone...