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KENNEDY SPACE CENTER, FLA. -- In Highbay 1 inside the Vehicle Assembly Building, technicians perform repair techniques to the external tank inside a tented area that protects the top of the tank. A severe thunderstorm with golf ball-sized hail caused visible divots in the giant tank's foam insulation and minor surface damage to about 26 heat shield tiles on the shuttle's left wing. A new target launch date has not been determined, but teams will focus on preparing Atlantis for liftoff in late April on mission STS-117. Photo credit: NASA/Jim Grossmann