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Improved understanding of the orbital debris environment in recent years and the prospect of significantly increased extravehicular activity (EVA) for the assembly and maintenance of Space Station Freedom have resulted in increased focus on the potential hazards to the EVA crewmembers from the micrometeoroid and orbital debris environments. While the hazards associated with any individual EVA remain extremely small, some estimates of the cumulative risks over the anticipated duration of the Space Station Program have been appreciable. These estimates, based on analytical models which treat the micrometeoroid and debris environments as isotropic, suggest the desirability of substantially modifying either the extravehicular mobility unit (EMU) or the planned EVA profiles for space station to reduce these hazards.