You are going to struggle with making a game out of it mostly, as religious martyrdom aside, the aim of the insurgent is just to survive; avoiding contact with troops where at all possible. The constant traditional complaint of troops in a CI role is that the enemy "won't stand and fight".
In Indochina only in the far North were conventional actions taking place. In Vietnam it was only the NVA who would try to engage the Americans on even terms and then only from a position of strength. In Rhodesia whole platoons-worth of assets would be turned out to chase-down groups of two or three insurgents, or more rarely ten or more; the 'Externals' everyone raves about were the only way to really hurt the insurgents. Those hurt the government more at the political level however.
Soldiers have boots on the ground flying the flag in any given area maybe one or two days a month, the rest of the time the insurgent is there reminding everyone of that fact; ergo to Joe Public it's the insurgent's territory and the soldiers are just passing through. When there is a fight, it's on the insurgent's terms and designed to show the population that they don't fear the regime.
Victory for the bad guys is being ever-present as a threat to people's lives and happiness, it rarely involves giving regime soldiers a thrashing. They are simply playing an entirely different game and at a quite different level. Why risk fighting soldiers when you can just intimidate voters into going your way?
Wargames on the other hand tend to play as a CI soldier's wet dream; they have the armour, the helicopters and technology and the bad guys decide to make a 'fair fight' of it by standing-up with their AKs.
