The combat zone just got a little more high-tech as soldiers in Afghanistan began testing and training on five prototype weapons that fire smart bullets. Army officials are calling the XM25 Counter Defilade Targeting Engagement System revolutionary since it is the first time soldiers will have a smart weapon in their hands. Smart weapons have some form of a processing unit that allows them to be self-guided or, in this case, have self-adjusting sights and programmable rounds. The XM25 — which is not much bigger than a standard service rifle — fires 25 mm rounds that can be programmed to...