KSC-95EC-0515 - Inertial Upper Stage booster in VPF Workers in the Vertical Processing Facility oversee and control the lowering of the Inertial Upper Stage (IUS) booster into a workstand for preflight processing. The IUS will be attached to the Tracking and Data Relay Satellite (TDRS-G), which will be deployed by the Space Shuttle Discovery on Mission STS-70. The IUS is scheduled to be mated to the TDRS satellite later in April. Liftoff of STS-70 is slated for no earlier than June 8. 4/4/95