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MIRV Possible Edits and References.
REFRENCE ISBN: 978-1-55750-681-8

Start Section Before Edit
The first true MIRV design was the Minuteman III, introduced in 1970, which held three smaller W62 warheads of about 170 kilotons in place of the single 1.2 megaton W56 used in the earlier versions of this missile. The smaller power of the warhead was offset by increasing the accuracy of the system, allowing it to attack the same hard targets as the larger, less accurate, W56. The MMIII was introduced specifically to address the Soviet construction of an anti-ballistic missile (ABM) system around Moscow; MIRV allowed the US to overwhelm any conceivable ABM system without increasing the size of their own missile fleet. The Soviets responded by adding MIRV to their R-36 design, first with three warheads in 1975, and eventually up to ten in later versions. While the United States phased out the use of MIRVs in 2014 to comply with New START, Russia continues to develop new missile designs using the technology.

Start Section After Edit (changes italicised and bolded)
The first true MIRV design was the Minuteman III, first successfully tested in 1968 and introduced into actual use in 1970, the Minuteman III held three smaller W62 warheads of about 170 kilotons each in place of the single 1.2 megaton W56 used in the earlier versions of this missile. From 1970-1975, the United States would remove approximately 550 earlier versions of the Minuteman ICBM in the Strategic Air Command's (SAC) arsenal and replace them with the new Minuteman III's outfitted with a MIRV payload, increasing their overall effectiveness (added citation here to cover the 2 sentences I edited). The smaller power of the warhead was offset by increasing the accuracy of the system, allowing it to attack the same hard targets as the larger, less accurate, W56. The MMIII was introduced specifically to address the Soviet construction of an anti-ballistic missile (ABM) system around Moscow; MIRV allowed the US to overwhelm any conceivable ABM system without increasing the size of their own missile fleet. The Soviets responded by adding MIRV to their R-36 design, first with three warheads in 1975, and eventually up to ten in later versions. While the United States phased out the use of MIRVs in 2014 to comply with New START, Russia continues to develop new missile designs using the technology.

MRV Section Before Edits
A multiple reentry vehicle payload for a ballistic missile deploys multiple warheads in a pattern against a single target (as opposed to multiple independently targetable reentry vehicle, which deploys multiple warheads against multiple targets). The advantage of an MRV over a single warhead is that the damage produced in the center of the pattern is far greater than the damage possible from any single warhead in the MRV cluster; this makes for an efficient area attack weapon. The number of warheads makes interception by anti-ballistic missiles unlikely.

Improved warhead designs allow smaller warheads for a given yield, while better electronics and guidance systems allow greater accuracy. As a result, MIRV technology has proven more attractive than MRV for advanced nations. Multiple-warhead missiles require both a miniaturised physics package and a lower mass reentry vehicle, both of which are highly advanced technologies. As a result, single warhead missiles are more attractive for nations with less advanced or less productive nuclear technology. The United States deployed an MRV payload on the Polaris A-3, as did the Royal Navy with the Chevaline upgrade. The Soviet Union deployed MRVs on the R-36 Mod 4 ICBM. Refer to atmospheric reentry for more details.

MRV Section After Edits
A multiple reentry vehicle payload for a ballistic missile deploys multiple warheads, also known as "bomblets", in a "shotgun" like pattern against a single target (as opposed to multiple independently targetable reentry vehicle, which deploys multiple warheads against multiple targets). The advantage of an MRV over a single warhead is the increased effectiveness due to the greater coverage, this increases the overall-damage produced within the center of the pattern making it far greater than the damage possible from any single warhead in the MRV cluster; this makes for an efficient area attack weapon and makes interception by anti-ballistic missiles unlikely due to the number of warheads being deployed at once (added citing to the source ).

Improved warhead designs allow smaller warheads for a given yield, while better electronics and guidance systems allow greater accuracy. As a result, MIRV technology has proven more attractive than MRV for advanced nations. Multiple-warhead missiles require both a miniaturised physics package and a lower mass reentry vehicle, both of which are highly advanced technologies. As a result, single warhead missiles are more attractive for nations with less advanced or less productive nuclear technology. 'The United States first began development of an MRV payload which was first used on the Polaris A-3 SLBM and was first deployed for use in 1964 on the USS Daniel Webster. The Polaris A-3 carried 3 "bomblets" each having an approximate yield of 200 Kt. The Royal Navy also had MRV payloads with the Chevaline upgrade. ( added extra info, reformed a pre existing sentence and added a citation)' The Soviet Union deployed MRVs on the R-36 Mod 4 ICBM. Refer to atmospheric reentry for more details.

Polaris A-3 before edits
This missile replaced the earlier A-1 and A-2 models in the US Navy, and also equipped the British Polaris force. The A-3 had a range extended to 2,500 nautical miles (4,600 kilometres) and a new weapon bay housing three Mk 2 re-entry vehicles (ReB or Re-Entry Body in US Navy and British usage); and the new W-58 warhead of 200 kt yield. This arrangement was originally described as a "cluster warhead" but was replaced with the term Multiple Re-Entry Vehicle (MRV). The three warheads were spread about a common target and were not independently targeted (such as a MIRV missile is). The three warheads were stated to be equivalent in destructive power to a single one-megaton warhead. Later the Polaris A-3 missiles (but not the ReBs) were also given limited hardening to protect the missile electronics against nuclear electromagnetic pulse effects while in the boost phase. This was known as the A-3T ("Topsy") and was the final production model

Polaris A-3 after edits
This missile replaced the earlier A-1 and A-2 models in the US Navy, and also equipped the British Polaris force. The A-3 had a range extended to 2,500 nautical miles (4,600 kilometres) and a new weapon bay housing three Mk 2 re-entry vehicles (ReB or Re-Entry Body in US Navy and British usage); and the new W-58 warhead of 200 kt yield. This arrangement was originally described as a "cluster warhead" but was replaced with the term Multiple Re-Entry Vehicle (MRV). The three warheads, also known as "bomblets", were spread out in a "shotgun" like pattern above a single target and were not independently targetable. (such as a MIRV missile is). The three warheads were stated to be equivalent in destructive power to a single one-megaton warhead due to their spread out pattern on the target . The first Polaris submarine outfitted with MRV A-3's was the USS Daniel Webster in 1964. Later the Polaris A-3 missiles (but not the ReBs) were also given limited hardening to protect the missile electronics against nuclear electromagnetic pulse effects while in the boost phase. This was known as the A-3T ("Topsy") and was the final production model

W58 Before Edits
The W58 was an American thermonuclear warhead used on the Polaris A-3 submarine-launched ballistic missile. Three W58 warheads were fitted as multiple warheads on each Polaris A-3 missile.

The W58 was 15.6 inches (400 mm) in diameter and 40.3 inches (1,020 mm) long, with a basic weight for the warhead of 257 pounds (117 kg). The yield was 200 kilotons.

The W58 design entered service in 1964 and the last models were retired in 1982 with the last Polaris missiles.

Researcher Chuck Hansen claims based on his US nuclear program research that the W55 and W58 warheads shared a common primary or fission first stage; this design was nicknamed the Kinglet primary by Hansen in 2001.

W58 Before Edits ( just made more precise measurments and verified the information, want to add my source as another source to back up this page dont know if counts toward edits)
The W58 was an American thermonuclear warhead used on the Polaris A-3 submarine-launched ballistic missile. Three W58 warheads were fitted as multiple warheads on each Polaris A-3 missile.

The W58 was 15.6 inches (396 mm) in diameter and 40.3 inches (1,016 mm) long, with a basic weight for the warhead of 257 pounds (116.6 kg). The yield was 200 kilotons.

The W58 design entered service in 1964 and the last models were retired in 1982 with the last Polaris missiles.

Researcher Chuck Hansen claims based on his US nuclear program research that the W55 and W58 warheads shared a common primary or fission first stage; this design was nicknamed the Kinglet primary by Hansen in 2001.

== LGM-30 Minuteman Possible edits Source(Lonnquest, J., Winkler, David F., Construction Engineering Research Laboratories, & Legacy Cold War Project, issuing body. (1996). To defend and deter : The legacy of the United States Cold War Missile Program. (USA-CERL special report; N-97/01). ==

Minuteman-I (LGM-30A/B or SM-80/HSM-80A) before edits
The LGM-30A Minuteman-I was first test-fired on 1 February 1961, and entered into the Strategic Air Command's arsenal in 1962, at Malmstrom Air Force Base, Montana; the "improved" LGM-30B became operational at Ellsworth Air Force Base, South Dakota, Minot Air Force Base, North Dakota, F.E. Warren Air Force Base, Wyoming, and Whiteman Air Force Base, Missouri in 1963. All 800 Minuteman-I missiles were delivered by June 1965. Each of the bases had 150 missiles emplaced. F.E. Warren AFB had 200 of the Minuteman-IB missiles. Malmstrom AFB had 150 of the Minuteman-I and about five years later added 50 of the Minuteman-II similar to those installed at Grand Forks AFB, ND.

Minuteman-I (LGM-30A/B or SM-80/HSM-80A) After edits(add extra information on
The LGM-30A Minuteman-I was first test-fired on 1 February 1961, and entered into the Strategic Air Command's arsenal in 1962. '''After the first full squadron of Minuteman I's were developed and ready to go the US Air Force had originally decided to station the missiles at the Vandenberg AFB in California, but before the missiles were set to be officially stationed there it was discovered that this first set of Minuteman missiles had defective boosters which limited their range from their initial 6,300 miles to 4,300 miles. This defect would cause the missiles to not be able to reach Russia by launching over the North Pole. The decision was made that the missiles be stationed at Malmstrom Air Force Base in Montana instead, this would allow the missiles, even with their defective boosters, to reach their intended targets in the case of a launch. The "improved" LGM-30B''' became operational at Ellsworth Air Force Base, South Dakota, Minot Air Force Base, North Dakota, F.E. Warren Air Force Base, Wyoming, and Whiteman Air Force Base, Missouri in 1963. All 800 Minuteman-I missiles were delivered by June 1965. Each of the bases had 150 missiles emplaced. F.E. Warren AFB had 200 of the Minuteman-IB missiles. Malmstrom AFB had 150 of the Minuteman-I and about five years later added 50 of the Minuteman-II similar to those installed at Grand Forks AFB, ND.

United States Before Edit
The German idea of an underground missile silo was adopted and developed by the United States for missile launch facilities for its intercontinental ballistic missiles. Most silos were based in Colorado, Nebraska, North Dakota, South Dakota, Missouri, Montana, Wyoming and other western states. There were three main reasons behind this siting: reducing the flight trajectory between the United States and the Soviet Union, since the missiles would travel north over Canada and the North Pole; increasing the flight trajectory from SLBMs on either seaboard, giving the silos more warning time in the event of a nuclear war; and locating obvious targets as far away as possible from major population centres. They had many defense systems to keep out intruders and other defense systems to prevent destruction (see Safeguard Program).

United States After Edit
The German idea of an underground missile silo was adopted and developed by the United States for missile launch facilities for its intercontinental ballistic missiles. Most silos were based in Colorado, Nebraska, North Dakota, South Dakota, Missouri, Montana, Wyoming and other western states. There were three main reasons behind this siting: reducing the flight trajectory between the United States and the Soviet Union, since the missiles would travel north over Canada and the North Pole; increasing the flight trajectory from SLBMs on either seaboard, giving the silos more warning time in the event of a nuclear war; and locating obvious targets as far away as possible from major population centres. They had many defense systems to keep out intruders and other defense systems to prevent destruction (see Safeguard Program). On top of the 3 previous mentioned site reasoning, the US Air Force had other site requirements that were also taken into account such as, having the sites be close enough to a populace of roughly 50,000 people for community support along with with making sure launch locations were far enough apart that a 10 MT detonation on near by strategic locations would not knock out other launch facilities in the area. '''"In 1960 the US Army established the Corps of Engineers Ballistic Missile Construction Office (CEBMCO), an independent organization under the Chief of Engineers, to supervise construction". This newly established organization was able to produce Minutemen Launch silos at an extremely fast rate of ~1.8 per day from 1961 to 1966 where they built a total of 1,000 Minuteman missile silos.'''