Welcome to today's Space Briefing, a biweekly roundup of the latest national security space news. Top story Shanahan says cost of Space Force could be in the 'single-digit' billions Deputy Defense Secretary Pat Shanahan said today the Pentagon estimates the cost to establish a new and separate Space Force could be less than $5 billion, despite earlier predictions from the Air Force that it could cost $13 billion over five years. News & notes Air Force awards Ball Aerospace $255M...