Boeing and Northrop Grumman have each presented the Air Force with design options for the next-generation intercontinental ballistic missile, the Ground-Based Strategic Deterrent. "This key program milestone was the culmination of years of analysis, aimed at helping the Air Force finalize its GBSD design," Carol Erikson, Northrop's vice president for GBSD, said in a July 21 email. The contractors offered analyses and recommendations for program requirements that would balance capability, cost and risk at technical interchange meetings with the Air...