U.S. Air Force Radar Problem Delays NROL-67 and SpaceX CRS-3 Launches, SpaceRef Business “A problem with the U.S. Air Force AN/MPS-39 Multiple Object Tracking Radar (MOTR) at the Eastern Range, reportedly a fire, has delayed the launch of the National Reconnaissance Office’s NROL-67 launch and now unofficially SpaceX’s launch of the CRS-3 resupply mission to the International Space Station.”