After years of secrecy, David Adair speaks out about what he saw at Nevada Air Force Range's infamous Area 51. When he was just 17, Adair built a rocket engine that so impressed the Air Force that he was asked to launch the rocket from the base. What he saw at Area 51 changed his life: The military has possession of an engine that was far too advanced for this world. Here, Adair explains the significance of his discovery of the alien engine.