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KENNEDY SPACE CENTER, FLA. - Inside the mobile service tower on Launch Pad 17-B at Cape Canaveral Air Force Station in Florida, workers get ready to destack the second stage segment from the Delta II rocket below. At the Boeing plant in Alabama, a leak was observed in the second-stage oxidizer tank for another Delta II that had been scheduled to launch in November; therefore, all identical tanks scheduled for launch in the near future are being checked. The second stage for the Delta II that will launch STEREO cannot be effectively tested while atop the first stage at Pad 17-B. STEREO stand…