Leaders of the 40th Infantry Division found a problem with their January 2020 Warfighter exercise: it took place in a city, but the computer software that it relied on could not accurately simulate urban warfare. During the exercise, which tests brigade and division staffs while simulating lower echelons on a computer, the division breezed through a city of 300,000 people on its way to an objective, without having to devote significant resources to the difficulties of urban warfare, according to...