Dustin Cammack, NASA Communications, far left, moderates a prelaunch news conference on Dec. 3, 2019, for SpaceX's 19th Commercial Resupply Services (CRS-19) mission for NASA to the International Space Station, at the agency’s Kennedy Space Center in Florida. From left, are Bryan Dansberry, assistant program scientist, International Space Station Program Science Office at NASA; Jessica Jensen, director, Dragon Mission Management at SpaceX; and Mike McAleenan, launch weather officer, U.S. Air Force 45th Space Wing. The SpaceX Flacon 9 rocket and Dragon cargo module are scheduled to launch on Dec. 4, 2019, from Space Launch Complex 40 on Cape Canaveral Air Force Station in Florida.