The Missile Defense Agency plans to begin work on tracking technology as a first step in a potential project that could build the case for arming uncrewed aircraft with a next-generation airborne laser powerful enough to defeat long-range ballistic missiles, according to a senior official. Missile Defense Agency Director Lt. Gen. Heath Collins added new details to the agency’s plan for a new directed-energy project -- first reported earlier this week -- during remarks at a June 6 event hosted...