The Missile Defense Agency is sending an unmistakable message to the U.S. defense industry: what you’ve built isn’t enough, and what you’re planning may not be what the nation needs. In a request for information published April 21 , the agency told traditional suppliers, researchers and non-traditional defense entrants to think beyond incremental improvements to existing systems and consider whether "fundamentally different capability constructs, architectures, or operational concepts" are required to meet a threat environment it projects will...