How the Army’s most tech-forward divisions are practicing for war

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&r