The Defense Advanced Research Projects Agency this week launched the latest development effort aimed at decreasing the weight of American combat vehicles. DARPA's new Ground X-Vehicle Technology (GXV-T) program "seeks to investigate revolutionary ground vehicle technologies that would simultaneously improve the mobility and survivability of vehicles through means other than adding more armor, including avoiding detection, engagement and hits by adversaries," according to an Aug. 18 announcement. The agency plans to host a proposers day on Sept. 5 to familiarize...