About 20,000 US forces, plus hundreds of British, Dutch and French troops as well as liaison officers from Italy, Spain, New Zealand and Australia are taking part in the exercise along the Atlantic coast off Virginia and North Carolina.
The exercise scenario takes place in a mythical region known as "Treasure Coast," with a country called Garnet, a theocracy, invading its neighbor to the north, Amberland, which calls for international help to repel the attack.