From the manual:
TacOps is primarily a simulation of contemporary and near-future tactical, ground, combat between United States (US), Canadian (CA), and New Zealand forces versus various opposing forces (OPFOR).
The primary simulation focus of TacOps is ground operations from the perspective of the battalion or regimental commander. The movement and interaction of infantry and armor units is treated with great detail. Supporting air and artillery activities are treated more conceptually.
TacOps may be played solitaire against an OPFOR computer opponent, or between two players on one or two computers. Play between two computers may be accomplished by using a
network, by exchanging small files via disk, by direct modem connection, by mail, or by electronic mail.
TacOps is played in turns. Each turn consists of two phases: an orders phase and a combat phase. Each phase occurs simultaneously for both players. In the orders phase you give orders to your units using buttons in windows and by tracing the intended movement of your units with mouse clicks on the screen. Once all orders have been given, the combat phase begins. During the combat phase the units of both forces, under computer control, simultaneously carry out their orders for movement and combat in four, fifteen second pulses. You only observe during the combat phase; you can not give or change orders until the next orders phase.
In TacOps you are a commander, not a gunner. Your control of weapons fire is limited to positioning your units with movement and disposition orders, setting minimum or maximum
engagement ranges, and designating priority targets.
TacOps features hidden movement to replicate "fog of war". The simulation begins with enemy units showing on your screen only if they are in some friendly unit's line of sight and visual range. You may also choose to see all units at all times.