Apollo 12 command module on display at the Virginia Air & Space Center in Hampton, VA. The space center is the official visitor center for the NASA Langley Research Center. Apollo 12 was the fourth flight to the moon, the second to actually land on the lunar surface, and the first Apollo to feature an all-Navy crew. Apollo 12 was struck by lightning shortly after launch, causing a major electrical problem. Just as it appeared that the mission would need to be aborted, controller John Aaron calmly suggested, "flight, try SCE to Aux." This obscure switch setting solved the problem, and Apollo 12 continued onto the moon. Aaron is widely credited for saving this mission.