Once U.S. forces were within range, Van Riper’s forces unleashed a barrage of missiles from ground-based launchers, commercial ships, and planes flying low and without radio communications to reduce their radar signature. Simultaneously, swarms of speedboats loaded with explosives launched kamikaze attacks. The carrier battle group’s Aegis radar system—which tracks and attempts to intercept incoming missiles—was quickly overwhelmed, and 19 U.S. ships were sunk, including the carrier, several cruisers, and five amphibious ships. “The whole thing was over in five, maybe ten minutes,” Van Riper said.
The problem? U.S. forces had expected Van Riper to sit back and come under attack, and then to launch a counterattack with his surviving forces, which could be easily brushed aside. Van Riper, who actually wanted to win the exercise, refused to sit on his hands and let the Americans attack first.
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https://www.popularmechanics.com/military/a30392654/mille