Today marks the anniversary of John Glenn’s Friendship 7 flight, NASA’s first orbital mission that launched on February 20, 1962. Every year the mission is celebrated as the flight that, at least temporarily, leveled the playing field between the Soviets and the Americans in the early days of the Space Race. But there’s more to the story than its triumphs. When Friendship 7 launched, the Atlas rocket that took Glenn into orbit had a 51 percent success rate. Glenn was never assigned the first orbital flight; he landed the assignment by chance. And the mission nearly became NASA’s first fatality. A warning light suggested the spacecraft’s heat shield had separated, which, if true, meant certain death for the astronaut during reentry.