Space shuttle Atlantis astronauts practiced the "dead guy test" drill while wrapping up their work at the international space station. The drill consists of an astronaut playing dead, and the other astronauts having to drag the incapacitated astronaut to safety.

It was the 100th EVA (Extra-Vehicular Activity) or spacewalk for American astronauts. The first spacewalk was in 1965 by Edward White II. It lasted twenty-one minutes. The 100th spacewalk lasted five- and-a-half hours.