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 A Minuteman III missile soars after a test launch. An intercontinental ballistic missile, or ICBM, is a long-range ballistic missile using a ballistic trajectory involving a significant ascent and descent, including sub-orbital flight. An ICBM differs little technically from other ballistic missiles such as intermediate-range ballistic missiles, short-range ballistic missiles, or the newly named theater ballistic missiles; these are differentiated only by maximum range. 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. Only three nations currently have operational ICBM systems: the United States, Russia, and China. However, other nations have ICBMs but not an organized ICBM system. In 2002, the United States and Russia agreed in the SORT treaty to reduce their deployed stockpiles to not more than 2,200 warheads each.
Flight phasesThe following flight phases can be distinguished:
See also Missile Defense Agency. HistoryEarly ICBMs formed the basis of many space launch systems. Examples include: Atlas, Delta, Redstone_rocket, Titan, R-7, and Proton. 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. Countries beginning developing ICBMs have all used liquid propellants initially, because the technology is easier. Modern ICBMsModern 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 I and SALT II). It has also proved to be an "easy answer" to proposed deployments of ABM systems – 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 only operational ABM systems were deployed in the 1970s, the US Safeguard ABM facility was located in North Dakota and was operational from 1975-1976. The USSR deployed its Galosh ABM system was deployed around Moscow in the 1970s and remains in service.  Modern ICBMs tend to use solid fuel, which can be stored easily for long periods of time. Liquid-fueled ICBMs were generally not kept fueled all the time, and therefore fueling the rocket was necessary before a launch. ICBMs are based either in missile silos, which offer some protection from military attack (including, the designers hope, some protection from a nuclear first strike), or on submarines, rail cars or heavy trucks, which are mobile and therefore hard to find. The low flying, guided cruise missile is an alternative to ballistic missiles. Specific missilesLand-based intercontinental ballistic missiles (ICBMs) and cruise missilesThe US Air Force currently operates just over 500 ICBMs at around 15 missile complexes located primarily in the northern Rocky Mountain states and the Dakotas. These are of the Minuteman III and Peacekeeper ICBM variants. Peacekeeper missiles are being phased out by 2005. All USAF Minuteman II missiles have been destroyed in accordance to START, and their launch silos sealed or sold to the public. To comply with the START II most US 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 500 missiles.[1] (http://www.thebulletin.org/issues/nukenotes/mj04nukenote.html) The United States Air Force awards two badges for performing duty in a nuclear missile silo. The Missile Badge is presented to commissioned officers while the Space and Missile Pin is awarded to silo ground and support personnel. Sea-based ICBMsMissing image FS_Redoutable_M20_tube.jpg M20 missile Launch tube n°1 aboard the Le Redoutable
Current and former US ballistic missiles
Soviet/RussianSpecific types of Soviet/Russian ICBMs include:
Ballistic missile submarinesSpecific types of ballistic missile submarines include:
See also
External links
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