The US Army's networked battlefield is taking shape. Spotty connections show the work ahead.

NGC2 was developed iteratively over a series of tests before Project Capstone Convergence at Fort Irwin, California. US Army photo by Sgt. Sar Paw The Army is testing a prototype version of its new command-and-control technology. Soldiers say it has sped up planning and helped dispersed units communicate. But drone issues and lost signals highlight challenges. The US Army is developing new warfighting software to change the way it fights a large-scale, high-speed, high-tech war. A major exe...