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CAPE CANAVERAL, Fla. – On Launch Complex 17-B at Cape Canaveral Air Force Station, a third solid rocket booster is raised from the transporter. It will join the others in the mobile service tower for attachment to the Delta II rocket that will launch the STSS Demonstrator spacecraft. The STSS Demonstrators is a midcourse tracking technology demonstrator and is part of an evolving ballistic missile defense system. STSS is capable of tracking objects after boost phase and provides trajectory information to other sensors. It will be launched by NASA for the Missile Defense Agency on July 29. Photo credit: NASA/Kim Shiflett