Attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, astronaut and mission specialist Kalpana Chawla, prepares to go underwater in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center. This particular training was in preparation for the STS-87 mission. The Space Shuttle Columbia (STS-87) was the fourth flight of the United States Microgravity Payload (USMP-4) and Spartan-201 satellite, both managed by scientists and engineers from the Marshall Space Flight Center.