Welcome to today's Space Briefing, a biweekly roundup of the latest national security space news. Top story Next-Gen OPIR underfunded by $1.6B in FY-19 budget, USAF may seek increase in FY-20 The Air Force underfunded its Space-Based Infrared System follow-on effort by about $1.6 billion in its fiscal year 2019 budget request and may seek to recover that difference in FY-20, according to a draft of the program's funding requirements. News & notes AEHF program office may use section 804...