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Lunar Landing Research Vehicle in Flight, California, USA, 1964. Lunar Landing Research Vehicle (LLRV) Number 1 in flight at the South Base of Edwards Air Force Base. When Apollo planning was underway in 1960, NASA was looking for a simulator to profile the descent to the moon's surface. Three concepts emerged: an electronic simulator, a tethered device, and the ambitious Dryden contribution, a free-flying vehicle. All three became serious projects, but eventually the NASA Flight Research Center's (FRC) Landing Research Vehicle became the most important. Lunar Landing Research Vehicle in Flight, California, USA, 1964. Creator: NASA. (KEYSTONE/HERITAGE IMAGES/HERITAGE SPACE)