Lightning War And Red Storm is a set of free wargames rules for modern warfare. They're in the files section of the Yahoo group. The author writes:
Lightning War is a game of warfare during the age of machinery. It is a game of strategy and tactics where battles (of perhaps more than one day) are able to be played in a few hours. The basic unit of control is the battalion (or national equivalent). This is a unit of individual bases (usually around four), where each base represents a company (or squadron of tanks). This battalion-sized unit is called a combat unit. A group of these combat units, usually two to four, is called a battle group. An example of a battle group is a British armoured brigade, where the individual armoured regiments are the combat units. The four bases within each represent the squadrons within the regiments. The focus of Lightning War is not on detail (for instance, range bands and armour penetration tables) but on troop types, the training of the soldiers involved and command control.