SS-11 Sego ICBM

The SS-11 Sego (designated the UR-100 in Soviet/Russian service) was the heart of Moscow's attempt to achieve numerical strategic parity with the U.S. in the 1960s. The liquid-propellant ICBM filled the same role in Soviet service as the U.S. Minuteman system.

The missile was a two-stage rocket, with the second stage slimmer than the first. The nosecone was rounded.

Using a two-stage tandem storable liquid-propellant missile, the SS-11 boosted a single warhead with a yield from...