Is the robotic X-37B a tool for spacewar, or a surveillance drone?

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Boeing's X-37B is the unmanned successor to the space shuttle which began a stealthy debut mission last month. Is it a tool for space warcraft, or part of an American surveillance program? Amateur skywatchers have captured early glimpses, and plotted its orbit. Officials are maintaining silence on the craft's mission, but consensus in the press so far seems to be that it is an orbital spy vehicle.
More in the New York Times. (image: Artist's rendering from NASA/Boeing Phantom Works, 1999)