Launch Complex 39B (LC-39B) is the second of Launch Complex 39's two launch pads, located at NASA's Kennedy Space Center in Merritt Island, Florida. The pad, along with Launch Complex 39A, were first designed for the Saturn V launch vehicle, which at the time was the United States' most powerful rocket. Typically used to launch NASA's crewed spaceflight missions since the late 1960s, the pad is currently being reconfigured for use by the agency's Space Launch System rocket, a Shuttle-derived launch vehicle which will be used in the Artemis program and subsequent Moon to Mars campaigns. The pad had also been leased for use by NASA to aerospace company Northrop Grumman, for use as a launch site for their Shuttle-derived OmegA launch vehicle, for National Security Space Launch flights and commercial launches, before the OmegA was cancelled.