Live training is conducted in a physical environment in limited maneuver space.
In a virtual environment, simulators operating on a virtual terrain take the place of weapon systems and can be linked to expand the training exercise.
Constructive simulation training uses computers to simulate battle elements. This enables multiple echelons of command and staff to execute their normal warfighting tasks in an unconstrained exercise environment.
Combining all three of these enables units to interact with one another and conduct a coordinated fight as though they were physically together on the same ground.