But while DARPA's "Terminator 2"-style morphing military robots may still be a long way off, many scientists are already working on robots that exhibit some of the characteristics required.

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U.S. military planners spent the next 50 years revising and refining the requirements of deterrence, spelling out in great detail the performance characteristics required of U.S. nuclear forces to assure they were both survivable and credible.

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Absent from this definition are any of the characteristics previously required for a Native American tribe to be recognized as such.

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Equally noteworthy is the absence from this definition of characteristics previously required for a Native American tribe to be recognized as such.

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Select appropriate techniques for the elicitation of detailed requirements taking into account the nature of the required changes, established practice and the characteristics and culture of those providing the requirements.

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The loose surface and different clay characteristics meant the crushed-brick surface required a different game plan, he said.

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This paper defines the essential quantitative and qualitative characteristics of a U.S. force structure required to meet the two-MRC standard for the near term and midterm.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century