It will be important to build multinational interoperability into the Army's next-generation command-and-control systems so that European allies can participate in advanced sensor-to-shooter networks, the commanding general of U.S. Army Europe and Africa said Sept. 1. "It's hard to make things interoperable after the fact, but it's also hard to write genetically into the requirements that something be interoperable," Gen. Christopher Cavoli said at the Army's Fires Conference at Ft. Sill, OK. "It's very hard to get right. I just...