The Air Force expects to unveil an updated bomber roadmap in September that will detail future bomber force-structure needs and identify the new B-21 Raider's role in that future fleet. Chief of Staff Gen. David Goldfein said Wednesday the service is in the midst of "aggressive dialogue" with Congress over its initial proposal for how the bomber fleet will shift to make room for the B-21 when it begins fielding in the mid 2020s. "We're in the process of doing...