RSD-10 Pioneer

• 1. Introduction

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  NATO gave the RSD-10 Pioneer a name of its own: the SS-20 Saber. Soviet engineers filed it under a far less memorable label, the GRAU designation 15Ж45. Whatever it was called, the weapon carried a nuclear warhead and stood ready across Soviet territory for a little more than a decade.

  What problem was this missile meant to solve that older Soviet weapons could not? Why did its arrival in the field push NATO toward one of the defining decisions of the Cold War? And what finally brought its service to an end?

• 2. Solid Fuel, Sudden Reach

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  Standing 16.5 meters tall and 1.8 meters in diameter, the missile weighed 37.1 tons fully assembled. It was built on two solid-fuel stages taken from the RT-21 Temp 2S, clad in fiberglass. That lineage is why it was also known as the RT-21M Pioneer. Its range started at between 600 and 5700 kilometers, and the final model could reach as far as 7500 kilometers. Early units carried a single warhead weighing 1.6 tons with a yield of 1 megaton. Later versions could carry one or two smaller 150 kiloton warheads. From 1980 onward, they could carry up to three, a design known as the Pioneer UTTH. This shift to multiple warheads came with better precision too. The circular error probable, a measure of accuracy, dropped from 550 meters to somewhere between 150 and 450 meters.

  It was the first Soviet missile built with solid fuel instead of liquid fuel. Liquid-fueled missiles required hours of dangerous work pumping propellant into the airframe before a launch could happen. A solid-fuel missile like the Pioneer could fire as soon as the order was given, without that fueling delay.

  The missile moved on a MAZ-547A/MAZ-7916 transporter erector launcher, built in the Belarusian SSR by the Minsk Automobile Plant. That launcher had not originally been designed for the Pioneer. It was built for the RT-21 Temp 2S intercontinental ballistic missile, and the Pioneer program simply adopted it.

• 3. Sharper With Each Upgrade

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  Testing of a modernized version, the Pioneer-UTTKh, began on the 10th of August 1979 at the Kapustin Yar test site. It ran through the 14th of August 1980, and the missile entered service on the 17th of December 1980. NATO designated this variant SS-20 Mod 3.

  The Mod 3 kept the same propulsion system as earlier Pioneers, carried under the GRAU designation 15Zh53. What changed was the command structure and the instrumentation-service unit. Those upgrades pushed accuracy from a circular error probable of 550 meters down to 450 meters. Maximum range grew by 10 percent, and the missile could spread its warheads over a wider area on the ground. NATO eventually gave this improved variant its own reporting name, SS-28 Saber 2.

• 4. A Contested Purpose

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  Two older missiles came before the RSD-10: the R-12 Dvina and the R-14 Chusovaya. NATO called them the SS-4 Sandal and the SS-5 Skean. Both had served the Soviet Union and Warsaw Pact states since 1958 and 1961, and the RSD-10 was meant to replace or supplement them. Development of the new missile began in 1966, and a design concept was approved in 1968. The Moscow Institute of Thermal Technology took on the project. It was led by Alexander Nadiradze, who was also developing the RT-21 Temp 2S at the same time. Flight testing started in 1974, and deployment commenced on the 11th of March 1976, with the first units becoming operational that August. By 1986, the Strategic Missile Forces controlled 48 launch sites, including one at Pavschino, holding a combined 435 RSD-10 missiles.

  Why the Soviet Union built this particular weapon is a matter of dispute among historians. Richard Perle, in the United States, saw it as part of a Soviet bid for global power. Others pointed to the SALT treaties, which placed limits on long-range missiles. Medium-range weapons like the RSD-10 fell outside those limits, arguably pushing Soviet planners toward this class of missile instead. A third explanation cast the RSD-10 as the offspring of a failure. After the RT-21 Temp 2S intercontinental missile program fell short, the Soviets repurposed its technology and parts for the new weapon.

• 5. Generals Versus Design Bureaus

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  Marshal Andrei Grechko, the Soviet Defence Minister through the 1960s, dominated missile procurement decisions during that decade. He rejected the idea that nuclear weapons should be a last resort, and he planned to open a third world war with an immediate nuclear strike on NATO nations.

  By the early 1970s, that stance had drawn opposition from within the military and the political leadership. Many wanted the Soviet Union to hold a second-strike capacity. That would let it avoid going nuclear the instant a war with the United States began.

  Marshal Dmitriy Ustinov's growing influence pushed Soviet thinking in a different direction. Ustinov had close ties to the Soviet design bureaus. He tended to back their demands over those of the military in disputes about weapons procurement. The decision to order and introduce the Pioneer in the mid-1970s owed much to Ustinov. He wanted to move procurement power away from the military and into the design bureaus. Those bureaus, in turn, lobbied for more and more varied weapons to keep their order books full.

  The British historian James Cant argued that this was the real story behind the missile. It was, in his view, a triumph of the Soviet military-industrial complex over the military itself in decisions about what weapons to build.

• 6. Forcing NATO's Hand

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  The Warsaw Pact held a substantial conventional military advantage over NATO in Central Europe. Soviet leaders assumed that NATO would respond to a major Warsaw Pact offensive by using tactical nuclear weapons to stop it. The RSD-10 gave the Soviet Union something it had lacked before: an in-theater, selective targeting capability rather than the ability to launch a broad strike.

  The missile could destroy every NATO base and installation with negligible warning. That gave the Soviet Union a way to neutralize NATO's tactical nuclear forces with precise strikes before they could be used.

  By 1979, the Soviet Union had established 14 RSD-10 launch sites, though only one was operational at that point. NATO answered by deciding to deploy American Pershing II missiles and BGM-109G Ground Launched Cruise Missiles across Western Europe. That decision became known as the NATO Double-Track Decision.

• 7. Destroyed by Treaty

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  A total of 654 RSD-10 missiles were built over the program's lifetime. Along with 499 associated mobile launchers, they were destroyed by May 1991 under the terms of the Intermediate-Range Nuclear Forces Treaty.

  Not every missile was scrapped. Fifteen RSD-10s were kept intact, alongside eight BGM-109G Gryphon and seven Pershing II missiles, preserved specifically to commemorate the treaty that ended their deployment. One surviving RSD-10 stands on the grounds of the National Museum of the History of Ukraine in the Second World War. Another is at the Ukraine Air Force Museum in Vinnytsia, Ukraine. A third sits inside the Smithsonian National Air and Space Museum in Washington, D.C.

  For part of the missile's service, it was fielded by the 23rd Guards Rocket Division, based at Kansk in Krasnoyarsk Krai, from around 1983 to 1988.

  The missile's transporter erector launchers outlived the treaty in one unexpected place. North Korea has acquired an unknown number of demilitarized RSD-10 launchers from Russia or Belarus, adapting them for use with its own BM25 Musudan missile.