US soldiers stormed a desert city in preparation for a high-tech war against a top foe. Here's how it went.

Soldiers have regularly used this hot desert city as a training site and sandbox for testing new technologies. US Army photo by Sgt. Nathan Arellano Tlaczani US Army soldiers simulated an urban assault against a formidable adversary. Drones and new software played a role, but basic combat skills remained central. Testing new tech during regular training brought both opportunities and complications. The US Bradley Fighting Vehicles were visible on the horizon as they raced toward the city.…