1987 Event Discovery's SRBs and External Tank are mated 1987 Event Stacking of Discovery's SRBs completed 1987 Event Stacking of Discovery's SRBs gets underway 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
