1987 Event Discovery's SRBs and External Tank are mated 1982 Event Challenger moves to Vandenberg AFB and mated for STS-6 1982 Event Columbia mated with SRBs and external tank in preparation for STS-5 1981 Event Columbia mated with SRBs and external tank for STS-2 mission 1980 Event Columbia mated to SRBs and external tank at Vehicle Assembly Building
