STS-29 tracking and data relay satellite D (TDRS-D) mating at KSC VPF

S89-27381 (29 Dec 1988) --- Technicians and engineers in the Kennedy Space Center's Vertical Processing Facility clean room prepare to participate in the mating of the STS 29 tracking and data relay satellite (TDRS-D) with its inertial upper stage (IUS-9, out of frame).