- Intercontinental ballistic missile
An intercontinental ballistic missile, or ICBM, is a long-range (greater than 5,500 km or 3,500 miles)
ballistic missiletypically designed for nuclear weapons delivery, that is, delivering one or more nuclear warheads. Due to their great range and firepower, in an all-out nuclear war, submarine and land-based ICBMs would carry most of the destructive force, with nuclear-armed bombers the remainder.
ICBMs are differentiated by having greater range and speed than other
ballistic missiles: intermediate-range ballistic missiles (IRBMs), medium-range ballistic missiles (MRBMs), short-range ballistic missiles (SRBMs), and the newly-named theatre ballistic missiles. Categorizing missiles by range is necessarily subjective and the boundaries are chosen somewhat arbitrarily.
World War II
The development of the first two-staged ICBM, A9/10, intended for use in bombing
New Yorkand other American cities, was undertaken in Nazi Germanyby the team of Wernher von Braununder "Projekt Amerika". The ICBM A9/A10 rocket initially was intended to be guided by radio, but was changed to be a piloted craft after the failure of Operation Elster. The second stage of the A9/A10 rocket was tested a few times in January and February of 1945. The progenitor of the A9/A10 was the German V-2 rocket, also designed by von Braun and widely used at the end of World War IIto bomb British and Belgian cities. All of these rockets used liquid propellants. Following the war, von Braun and other leading German scientists were secretly transferred to the United States to work directly for the U.S. Army through Operation Paperclip, developing the IRBMs, ICBMs, and launchers.
In 1953, the USSR initiated, under the direction of the
reactive propulsion engineer Sergey Korolyov, a program to develop an ICBM. Korolyov had constructed the R-1, a copy of the V-2 based on some captured materials, but later developed his own distinct design. This rocket, the R-7, was successfully tested in August 1957 and, on October 4, 1957, placed the first artificial satellite in space, Sputnik.
In the USA, competition between the U.S. armed services meant that each force developed its own ICBM program. The U.S. initiated ICBM research in 1946 with the
MX-774. However, its funding was cancelled and only three partially successful launches in 1948, of an intermediate rocket, were ever conducted. In 1951, the U.S. began a new ICBM program called MX-774 and B-65 (later renamed Atlas). The U.S.'s first successful ICBM, the Atlas A, was launched on 17 December 1957, four months after the Soviet R-7 flight.
Military units with deployed ICBMs would first be fielded in 1959, in both the Soviet Union and the United States. The R7 and Atlas both required a large launch facility, making them vulnerable to attack, and could not be kept in a ready state.
These early ICBMs also formed the basis of many space launch systems. Examples include Atlas,
Redstone rocket, Titan, R-7, and Proton, which was derived from the earlier ICBMs but never deployed as an ICBM. The Eisenhower administration supported the development of solid-fueled missiles such as the LGM-30 Minuteman, Polaris and Skybolt. Modern ICBMs tend to be smaller than their ancestors, due to increased accuracy and smaller and lighter warheads, and use solid fuels, making them less useful as orbital launch vehicles.
Deployment of these systems was governed by the strategic theory of
Mutually Assured Destruction. In the 1950s and 1960s, development began on Anti-Ballistic Missile systems by both the U.S. and USSR; these systems were restricted by the 1972 ABM treaty.
SALTtreaty froze the number of ICBM launchers of both the USA and the USSR at existing levels, and allowed new submarine-based SLBMlaunchers only if an equal number of land-based ICBM launchers were dismantled. Subsequent talks, called SALT II, were held from 1972 to 1979 and actually reduced the number of nuclear warheads held by the USA and USSR. SALT II was not ever ratified by the United States Senate, but its terms were nevertheless honored by both sides until 1986, when the Reagan administration "withdrew" after accusing the USSR of violating the pact.
In the 1980s, President
Ronald Reaganlaunched the Strategic Defense Initiativeas well as the MX and MidgetmanICBM programmes.
In 1991, the
United Statesand the Soviet Unionagreed in the START Itreaty to reduce their deployed ICBMs and attributed warheads. As of 2008, all five of the nations with permanent seats on the United Nations Security Councilhave operational ICBM systems: all have submarine-launched missiles, and Russia, the United Statesand China also have land-based missiles. In addition, Russiaand China have mobile land-based missiles. Indiais reported to be developing a new variant of the Agni missile, called the Agni 4, which is reported to have a strike range of 6,000 km [ [http://timesofindia.indiatimes.com/India_plans_6000-km_range_Agni-IV_missile/articleshow/2618413.cms Times of India: India plans 6,000-km range Agni-IV missile] ] . There have also been speculations that India is developing another class of ICBMs called the "Surya". No credible sources however can confirm if the 'Surya' program actually exists.
It is speculated by some
intelligence agenciesthat North Koreais developing an ICBM; [ [http://www.fas.org/nuke/guide/dprk/missile/td-2.htm Taep'o-dong 2 (TD-2) - North Korea ] ] two tests of somewhat different developmental missiles in 1998 and 2006 were not fully successful. [ [http://edition.cnn.com/2006/WORLD/asiapcf/07/04/korea.missile/] [http://www.cnn.com/2006/WORLD/asiapcf/07/05/korea.missile/index.html] ]
Most countries in the early stages of developing ICBMs have used liquid propellants, with the known exceptions being the planned
South AfricanRSA-4 ICBM and the now in service Israeli Jericho 3 [http://www.astronautix.com/lvfam/jericho.htm] .
The following flight phases can be distinguished:
boost phase— 3 to 5 minutes (shorter for a solid rocketthan for a liquid-propellant rocket); altitude at the end of this phase is typically 150 to 400 km depending on the trajectory chosen, typical burnout speed is 7 km/s.
* midcourse phase — approx. 25 minutes —
sub-orbital spaceflightin an elliptic orbit; the orbit is part of an ellipsewith a vertical major axis; the apogee(halfway the midcourse phase) is at an altitude of approximately 1200 km; the semi-major axisis between 3,186 km and 6,372 km; the projection of the orbit on the Earth's surface is close to a great circle, slightly displaced due to earth rotation during the time of flight; the missile may release several independent warheads, and penetration aidssuch as metallic-coated balloons, aluminum chaff, and full-scale warhead decoys.
reentryphase (starting at an altitude of 100 km) — 2 minutes — impact is at a speed of up to 4 km/s (for early ICBMs less than 1 km/s); see also maneuverable reentry vehicle.
Modern ICBMs typically carry
multiple independently targetable reentry vehicles ("MIRVs"), each of which carries a separate nuclear warhead, allowing a single missile to hit multiple targets. MIRV was an outgrowth of the rapidly shrinking size and weight of modern warheads and the Strategic Arms Limitation Treaties which imposed limitations on the number of launch vehicles ( SALT Iand SALT II). It has also proved to be an "easy answer" to proposed deployments of ABM systemsndash it is far less expensive to add more warheads to an existing missile system than to build an ABM system capable of shooting down the additional warheads; hence, most ABM system proposals have been judged to be impractical. The first operational ABM systems were deployed in the 1970s, the U.S. Safeguard ABM facility was located in North Dakota and was operational from 1975–1976. The USSR deployed its Galosh ABM system around Moscow in the 1970s, which remains in service. Israel deployed a national ABM system based on the Arrow missile in 1998, [ [http://www.ishitech.co.il/1102ar1.htm Israeli Arrow ABM System is Operational as War Clouds Darken ] ] but it is mainly designed to intercept shorter-ranged theater ballistic missiles, not ICBMs. The U.S. Alaska-based National Missile Defense system attained initial operational capability in 2004. [ [http://www.missilethreat.com/systems/fort_greely.html MissileThreat :: ] ]
ICBMs can be deployed from multiple platforms:
missile silos, which offer some protection from military attack (including, the designers hope, some protection from a nuclear first strike)
submarines: submarine-launched ballistic missiles (SLBMs); most or all SLBMs have the long range of ICBMs (as opposed to IRBMs)
* on heavy trucks; this applies to one version of the
RT-2UTTH Topol Mwhich may be deployed from a self-propelled mobile launcher, capable of moving through roadless terrain, and launching a missile from any point along its route
* mobile launchers on rails; this applies, for example, to РТ-23УТТХ "Молодец" (RT-23UTTH "Molodets"—SS-24 "Sсаlреl") The last three kinds are mobile and therefore hard to find.
During storage, one of the most important features of the missile is its serviceability. One of the key features of the first computer-controlled ICBM, the
Minuteman missile, was that it could quickly and easily use its computer to test itself.
In flight, a booster pushes the warhead and then falls away. Most modern boosters are solid-fueled rocket motors, which can be stored easily for long periods of time. Early missiles used liquid-fueled rocket motors. Many liquid-fueled ICBMs could not be kept fuelled all the time as the cryogenic liquid oxygen boiled off and caused ice formation, and therefore fueling the rocket was necessary before launch. This procedure was a source of significant operational delay, and might cause the rockets to be destroyed before they could be used. To resolve this problem the British invented the
missile silothat protected the missile from a first strikeand also hid fuelling operations underground.
Once the booster falls away, the warhead falls on an unpowered path much like an orbit, except that it hits the earth at some point. Moving in this way is stealthy. No rocket gases or other emissions occur to indicate the missile's position to defenders. Also, it is the fastest way to get from one part of the Earth to another. This increases the element of surprise. The high speed of a ballistic warhead (near 5 miles per second) also makes it difficult to intercept.
Many authorities say that missiles also release aluminized balloons, electronic noisemakers, and other items intended to confuse interception devices and radars (see
The high speed can cause the missile to get very hot as it reenters the atmosphere. Ballistic warheads are protected by heatshields constructed of materials such as
pyrolytic graphite, and in early missiles, thick plywood. Plywood approaches the strength per weight of carbon fiber/epoxy composites and chars slowly, protecting the missile.Fact|date=February 2007
Accuracy is crucial, because doubling the accuracy decreases the needed warhead energy by a factor of four. Accuracy is limited by the accuracy of the navigation system and the available geophysical information.
Strategic missile systems are thought to use custom
integrated circuits designed to calculate navigational differential equations thousands to millions of times per second in order to reduce navigational errors caused by calculation alone. These circuits are usually a network of binary addition circuits that continually recalculate the missile's position. The inputs to the navigation circuit are set by a general purpose computer according to a navigational input schedule loaded into the missile before launch.
One particular weapon developed by the Soviet Union (
FOBS) had a partial orbital trajectory, and unlike most ICBMs its target could not be deduced from its orbital flight path. It was decommissioned in compliance with arms control agreements, which address the maximum range of ICBMs and prohibit orbital or fractional-orbital weapons.
cruise missiles are an alternative to ballistic missiles.
U.S. Air Forcecurrently operates 450 ICBMs around three air force bases located primarily in the northern Rocky Mountain states and North Dakota. These are of the LGM-30 MinutemanIII ICBM variant only. Peacekeeper missiles were phased out in 2005. [ [http://www.af.mil/news/story.asp?storyID=123011845 Peacekeeper missile mission ends during ceremony ] ]
Minuteman IImissiles have been destroyed in accordance with START, and their launch silos have been sealed or sold to the public. To comply with the START IImost U.S. multiple independently targetable reentry vehicles, or MIRVs, have been eliminated and replaced with single warhead missiles. However, since the abandonment of the START II treaty, the U.S. is said to be considering retaining 800 warheads on 450 missiles. [http://www.thebulletin.org/issues/nukenotes/mj04nukenote.html]
MIRVed land-based ICBMs are considered destabilizing because they tend to put a premium on striking first. If we assume that each side has 100 missiles, with 5 warheads each, and further that each side has a 95 percent chance of neutralizing the opponent's missiles in their silos by firing 2 warheads at each silo, then the side that strikes first can reduce the enemy ICBM force from 100 missiles to about 5 by firing 40 missiles at the enemy silos and using the remaining 60 for other targets. This first-strike strategy increases the chance of a nuclear war, so the MIRV weapon system was banned under the
The United States Air Force awards two badges for performing duty in a nuclear missile silo. The
Missile Badgeis presented to enlisted and commissioned maintainers while the Space and Missile Pin is awarded to enlisted and commissioned operators.
*The U.S. Navy currently has 14 "Ohio"-class
SSBNs deployed. [There are a total of 18 "Ohio"-class submarines in the US Navy inventory; however four of these submarines have been retrofitted to carry and fire cruise missiles, and are no longer considered ballistic missile subs.] Each submarine is equipped with a complement of 24 Trident II missiles, for a total of 288 missiles equipped with 1152 nuclear warheads.
Russian Navycurrently has 13 SSBNs deployed, including 6 Delta III class submarines, 6 Delta IV class submarines and 1 Typhoon class submarine, for a total of 181 missiles equipped with 639 nuclear warheads. Missiles includes the R-29R, R-29RM/Sinevaand Bulava SLBMs (deployed on the single Typhoon SSBN as a testbed for the next generation Borei class submarines being built).
French Navyconstantly maintains at least four active units, relying on two classes of nuclear-powered ballistic submarines ( SSBN): the older "Redoutable" class, which are being progressively decommissioned, and the newer "le Triomphant" class. These carry 16 M45 missiles with TN75 warheads, and are scheduled to be upgraded to M51 nuclear missiles around 2010.
Royal Navyhas four Vanguard class submarines, each armed with 16 Trident II SLBMs.
China's People's Liberation Army Navy(PLAN) has one Xia class submarinewith 12 single-warhead JL-1 SLBMs. The PLAN has also launched at least two of the new Type 094 SSBNthat will have 12 JL-2SLBMs (possibly MIRV) which are in development.
Current and former U.S. ballistic missiles
* Atlas (SM-65, CGM-16) former ICBM launched from silo, the rocket is now used for other purposes
Titan I(SM-68, HGM-25A) Based in underground launch complexes.
Titan II(SM-68B, LGM-25C) — former ICBM launched from silo, the rocket is now used for other purposes
* Minuteman I (SM-80, LGM-30A/B, HSM-80)
* Minuteman II (LGM-30F)
* Minuteman III (LGM-30G) — launched from silo — as of November, 2006, there are 500 Minuteman III missiles in active inventory
LGM-118A Peacekeeper/ MX (LGM-118A) — silo-based; decommissioned in May 2006
* Midgetman — has never been operational — launched from mobile launcher
* Polaris A1, A2, A3 — (UGM-27/A/B/C) former SLBM
* Poseidon C3 — (UGM-73) former SLBM
* Trident — (UGM-93A/B) SLBM — Trident II (D5) was first deployed in 1990 and is planned to be deployed past 2020.
Specific types of Soviet/Russian ICBMs include:
*MR-UR-100 Sotka / 15A15/ SS-17 Spanker
*R7 Semyorka / 8K71 / SS-6 Sapwood
*R-9 Desna / SS-8 Sasin
*R-36 SS-9 Scarp
*R-36M2 Voevoda / SS-18 Satan
RS-24is MIRV-equipped and thermonuclear. It has two tests since 2005.
*RT-23 Molodets / SS-24 Scalpel
*RT-2PM Topol / 15Zh58 / SS-25 Sickle
*RT-2UTTKh Topol M / SS-27
UR-1008K84 / SS-11 Sego
UR-100N15A30 / SS-19 Stiletto
People's Republic of China
Specific types of Chinese ICBMs called Dong Feng ("East Wind").
DF-3— cancelled. Program name transferred to a MRBM.7,000 km
DF-5 CSS-4— silo based, 10,000 km range.
DF-22— cancelled by 1995.
DF-31 CSS-9— silo and road mobile, 2,500 km range.
DF-31A CSS-9— silo and road mobile, 1,500 km range.
DF-41 CSS-X-10— entering service soon
France only deploys submarine launched ICBMs, with all land based ones decommissioned
*M4 — Decommissioned in 2003.
*M45 — In service.
*M51.1 — Expected to enter service in 2010.
*M51.2 — Expected to enter service in 2015.
*Agni-V - 5,000-6,000 km range (2010) [ [http://afp.google.com/article/ALeqM5gp8mO5oSUBOAiJXZETsD6b9M26EA AFP: India building 6,000km nuclear-capable missile] ]
*Surya [  ] (planned)
*Jericho III — 6,000–7,800 km range suspected to be stockpiled throughout Israel
Taepodong-2estimated 5,000–6,000 km range
Ballistic missile submarines
Specific types of
ballistic missile submarines include:
*"George Washington" class - flagicon|USA
*"Ethan Allen" class - flagicon|USA
*"Lafayette" class - flagicon|USA
*"Benjamin Franklin" class - flagicon|USA
*"Ohio" class - flagicon|USA
*"Resolution" class - flagicon|UK
*"Vanguard" class - flagicon|UK
*"Borei" class - flagicon|Russia
*"Typhoon" class- flagicon|Soviet Union flagicon|Russia
*"Delta IV" class - flagicon|Soviet Union
*"Redoutable" class - flagicon|France
*"Triomphant" class - flagicon|France
*Type 092 ("Xia" class) - flagicon|China
*Type 094 ("Jin" class) - flagicon|China
Advanced Technology Vessel- flagicon|India
Israel and weapons of mass destruction
Pakistan and weapons of mass destruction
People's Republic of China and weapons of mass destruction
France and weapons of mass destruction
India and weapons of mass destruction
Russia and weapons of mass destruction
United States and weapons of mass destruction
United Kingdom and weapons of mass destruction
Anti-Ballistic Missile Treaty
Force de frappe"
Fractional Orbital Bombardment System
Air Force Space Command
Missile Defense Agency
* [http://es.rice.edu/projects/Poli378/Nuclear/f04.stratg_invent.html Estimated Strategic Nuclear Weapons Inventories (September 2004)]
* [http://www.fas.org/nuke/guide/usa/icbm/index.html Intercontinental Ballistic and Cruise Missiles]
* [http://www.RC135.com "A Tale of Two Airplanes"] by Ltc. Kingdon R. Hawes
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