Astronauts not only needed to practice being weightless, they also needed to practice for when they’d encounter real water after splashing down on their return to Earth. Here, Apollo 1 astronauts Gus Grissom (exiting craft), Roger Chafee (center) and Ed White (foreground) participate in egress training in June 1966 at Ellington Air Force Base. Less than a year later, this crew would meet a tragic end when they were killed after a  fire broke out during a launch rehearsal.