The US Joint Forces Command is preparing the largest simulated exercise in US military history.
Millennium Challenge 2002 has been designed to model how wars will be fought by 2007. It will combine live field exercises and state-of-the-art computer systems.
More than 13,500 troops will take part in exercises at locations in southern California and Nevada.
In a situation reminiscent of the film Wargames, everything that happens on the ground will be integrated with a new computer system called Common Relevant Operational Picture.
The system allows commanders to gather detailed information from the field, while remaining in real-time contact with their forces and other military personnel anywhere in the world.
Joint Forces Command officials explained that the overall aim is to transform the military from a heavy, mechanised force into a highly mobile one.
Spokesman Tony Billings told Reuters that recent world events showed that future forces will need to be capable of "rapidly and decisively striking at the enemy's centre of gravity".
Millennium Challenge gets underway on 24 July and runs until 15 August.
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