SCHOFIELD BARRACKS, Hawaii —Inside a mud-splattered tent, the Army’s vice chief and the commander of the 25th Infantry Division watched on two giant TV screens as the division attempted to repel an enemy attack from the sea. Just outside, the service’s first launched-effects battery used an unmanned reconnaissance glider that arrived about a month before to provide a picture of the simulated assault, while the division’s new HIMARS rocket launchers shot down “enemy” drones.

“We have old stuff, we have new stuff, and we’re fighting in a new way,” said Col. Dan Von Benken, the division’s artillery commander.

It was the last day of a two-week Joint Pacific Multinational Readiness Center exercise, and this constructed amphibious battle was the end of a scenario in which the soldiers worked

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