Sen. John F. Kerry greets Kennedy Space Center employees during a tour of the Orbiter Processing Facility OPF.

Sen. John F. Kerry, D-Mass., greets Kennedy Space Center employees during a tour of the Orbiter Processing Facility (OPF). The orbiter Discovery is being prepared for flight in the OPF on the next Space Shuttle mission. The tour follows a public meeting Kerry held at the Dr. Kurt H. Debus Conference Facility at the Kennedy Space Center Visitor Complex. He said he chose to speak at KSC because it symbolizes America’s commitment to science, innovation and technology. He and Sen. John Edwards, D-N.C., are on a speaking tour prior to their appearance at the Democratic National Convention in Boston.