Delta 1604 was a three-stage Delta 1000-series configuration with the MB-3-powered extended long-tank first stage, six Castor II strap-on motors, the 1.65-metre AJ10-118F second-stage and fairing arrangement, and a TE-M-364-4 solid third stage. Two vehicles successfully launched Explorer 47 and Explorer 50 into highly elliptical magnetospheric orbits in 1972 and 1973.
Future launches and major activity directly linked to this vehicle family.