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KENNEDY SPACE CENTER, FLA. - On the dock at Port Canaveral in Florida, a worker secures a crane hook on an X-band radar to be transferred to and installed on the U.S. Naval Ship Hayes. The radar will support the July 1 launch of Space Shuttle Discovery on mission STS-121. There are two Continuous Pulse Doppler X-band radars located on ships for the STS-121 launch. The other one is mounted on a booster recovery ship downrange of the launch site. The two radars provide velocity and differential Shuttle/debris motion information. Combined with the C-band radar located at the Haulover Canal near the launch site, they provide high definition images of any debris that might fall from the external tank/shuttle. The X-band data (screen captures) will be sent from the ships via satellite link to the National Center for Atmospheric Research site. Photo credit: NASA/Jim Grossmann