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KENNEDY SPACE CENTER, FLA. -- Inside Orbiter Processing Facility 3 at Kennedy Space Center, technicians prepare to install engine No. 3 as it nears the aft fuselage of the vehicle during processing for mission STS-120. Mission STS-120 will be the 23rd flight to the International Space Station. Space Shuttle Discovery will carry the U.S. Node 2. Launch is targeted for Oct. 20. NASA/Dimitri Gerondidakis