The Army is looking for ways to accelerate the production of an air and missile defense command-and-control system for the international market, a move that observers say could determine the degree of international compatibility of sensors and shooters in future conflicts. At issue is the exportability of the Integrated Air and Missile Defense Battle Command System, made by Northrop Grumman. The system features an open architecture, which means domestic and foreign equipment can be incorporated into a larger network if...