Welcome to today's Space Briefing, a new biweekly roundup of the latest national security space news. Top story Pentagon moves to create Space Force as a new branch of the military At the behest of President Trump, the Pentagon has begun taking immediate steps to establish a sixth branch of the U.S. military -- a Space Force -- by 2020, though its creation requires congressional authorization, according to a new report provided to Congress. News & notes Defense experts fear...