 LC-39B was deactivated first on January 1, 2007.Three lightning towers were added to the pad and it was temporarily "re-activated" in April 2009 when "Endeavour" was placed on standby to rescue the STS-125 crew (the STS-125 mission was the last to visit the Hubble Space Telescope, which meant that the ISS was out of range) if needed; "Endeavour" was then moved over to LC-39A for STS-126.In October 2009 the prototype Ares I-X rocket was launched from 39B.