As the Air Force looks to speed up its plans to field the follow-on to its Space Based Infrared System constellation, lawmakers want more details about the new architectures the service may pursue. The House Armed Services strategic forces subcommittee mark of fiscal year 2019 defense policy legislation proposes language that would require the Air Force to study the benefits, risks and cost-savings associated with using various satellite buses for strategic and tactical payloads -- analysis that would provide information...