The Air Force's top uniformed acquisition official said this week the service doesn't need much more in law, policy or guidance to achieve its open-architecture goals, noting that more bureaucracy could hinder its work. Open-architecture, or "plug-and-play" systems that allow for broader interoperability and faster, more incremental upgrades, is a growing focus meant to make the Air Force's technology and weapon systems more flexible. The B-21 bomber will be the first aircraft built with open architecture from the start, and...