(Editor's Note: This article has been updated to reflect that Booz Allen Hamilton won a contract worth up to $800 million in May to serve as the lead integrator for a marquee "Joint Warfighting" initiative, and not Northrop Grumman.) The Pentagon is working with major U.S. technology companies on a range of artificial intelligence projects, including software to help streamline warfighting operations, according to the head of the Joint Artificial Intelligence Center. Nand Mulchandani, who took over as acting...