Launch Complex 39A will be the focus of a briefing on NASA TV beginning at 3 p.m. You can tune in to NASA TV or watch it streaming here. The launch pad was built for the Apollo/Saturn V missions that carried astronauts to the moon. It was modified for space shuttle launches. SpaceX modified it again for Falcon rockets such as the Falcon 9 scheduled to launch tomorrow morning at 10:01 a.m. EST to begin the CRS-10 cargo resupply mission to the International Space Station. Photo credit: NASA/Glenn Benson