Now you're talking.
Kennedy, having launched a second and completely successful invasion of Cuba in 1964, had subsequently been re-elected with such a landslide that he was acclaimed President-For-Life.
With the success of his moon landing challenge for the '60s, Kennedy's project for the '70s was a permanent moonbase to be created underground. To carve out the underground caverns, in 1973 nukes were drilled into the lunar surface and detonated. To their horror, the NWO found their own secret underground moonbase was breached by the explosions and an unlucky hit on their nuclear arsenal detonated the lot, with a cataclysmic explosion which shattered the moon.
Kennedy was hastily taken to Area 52 and shown the Lizard's secret teleport system. With mere hours to go before a major portion of the disrupted moon struck the earth and destroyed all life, the teleport system was rapidly reprogrammed on the President's orders to take a single passenger back 10 years. Seizing a rifle, Kennedy leapt into the transporter beam and hurled himself back to Dallas in 1963 where he took careful aim and shot himself thereby changing history and preventing him from destroying life on earth.
True story.