VALVES RCS FUEL RCS OXIDIZER TANK 4-5 The engine is.

DATA VOICE COORDINATION DOMSAT DOMESTIC SATELLITE DSN DEEP SPACE NETWORK GSFC GODDARD SPACE FLIGHT CENTER IUS INERTIAL UPPER STAGE/ (AUTOMATED FOR SPINNING SOLID UPPER INERTIAL UPPER STAGE/ (AUTOMATED FOR SPACELAB HORIZONTAL PALLETS LOADING) CHECKOUT BUILDING INCOMING PAYLOADS MULTIUSE MISSION SUPPORT EQUIPMENT PAYLOAD CANISTER (HORIZONTAL) TO PAD VIA VEHICLE TRANSPORTATION ASSEMBLY INTERSITE BUILDING CANISTER (IN ORBITER) AUTOMATED PAYLOADS PROCESSING.