The first test launch took place in January 1987 and the first sea trial, which was unsuccessful, occurred in March 1989. The ugm133a trident ii or trident d5 is a submarine-launched ballistic missile that is a critical component of the United States' strategic nuclear triad. The Trident missile system is housed on the UK's four Vanguard class submarines which form the UK's strategic nuclear missile force. Both Trident versions are three-stage, solid-propellant, inertially guided missiles, and both guidance systems use a star sighting to improve overall weapons system accuracy. 5 How many Trident II missiles are on a Vanguard class submarine? It is highly effective when used for ocean surveillance, and can assist the U.S. Navy in anti-ship and mine-laying operations. This is despite the opposition of the people of Scotland, civil society, the STUC, Scotland's churches, the Scottish Parliament and most of Scotland's MPs. The Arihants carry up to 12 K-15 missiles in four launchers, each armed with one warhead with a range of 466 miles or four K-4 missiles with a range of 2,174 miles. Ohio-class/Trident ballistic missile submarines provide the sea-based leg of the triad of U.S. strategic offensive forces. Vanguard carried out her first Trident II missile firing in 1994, and undertook her first operational patrol in 1995. The United States has400 Minuteman III intercontinental ballistic missiles (ICBMs) stationed in silos in the upper Midwest and Rocky Mountain areas. The Trident II D5 fleet ballistic missile (FBM) is a three-stage, solid-propellant, inertial-guided ballistic missile developed by Lockheed Martin. It is three-staged and uses solid-propellant.9, The 2018 Nuclear Posture Review highlighted the need for a new low-yield Trident missile to deter adversary use of similarly low-yield nuclear weapons.10 Congress appropriated $65 million in FY2019 and $10 million in FY2020 to fund the new warhead, which was designated the W76-2. Depot maintenance responsibility for the B-2 is performed by Air Force contractor support and is managed at the Oklahoma City Air Logistics Center at Tinker Air Force Base, Oklahoma. The UK has approximately 225 nuclear weapons, and initiated its nuclear arms programme during the Second World War. The first eight Ohio-class boats were originally built to launch the Trident IC4ballistic missilean advanced version of the earlier PoseidonSLBM. With estimated costs of $46 billion each to manufacture, the next-generation boomers may be fewer in number and will use new reactors that do not require expensive overhauls and refueling, allowing them to serve on until 2085. Kyle Mizokami is a defense and national-security writer based in San Francisco who has appeared in the Diplomat, Foreign Policy, War is Boring and the Daily Beast. Nine countries currently have nuclear weapons: the US, UK, Russia, France, China . How much damage would a Trident missile do? It has a maximum range of about 6,500 nautical miles (12,000 km). It could deliver eight independently targetable 100-kiloton nuclear warheads to a range of 4,000 nautical miles (7,400 km). The Trident II is a long-lasting c-based device capable of attacking a wide range of targets. The second conventional warhead version is a fragmentation version that would disperse thousands of tungsten rods which could obliterate an area of 3000 square feet (approximately 280 square meters). The British Trident warheads are capable of selective yield, ranging from under a kiloton up to the full yield of 100 kt or so (this appears to differ from U.S. SLBM warheads). Nuclear power means the vessels can operate submerged for months at a time, their endurance limited only by the supplies needed to sustain their crews of more than 150 sailors. [5], The total cost of the Trident program thus far came to $39.546 billion in 2011, with a cost of $70 million per missile.[6]. These deadly missiles have a minimum range of 5 500 km. A small number of W76-2 low-yield warheads have also been deployed on some Ohio-class submarines. US Navy test firing two Trident II D-5 UGM-133A missiles in the Atlantic Missile Range, June 2014 (DASO 25 SSBN 736) during a Demonstration and Shakedown Operation. The Trident II was the original missile on the British Vanguard-class and American Ohio-class SSBNs from Tennessee on. Whiteman Air Force Base, Missouri, is the only operational base for the B-2. Platforms: Payload: U.S.. All of the deployed warheads are controlled by the Royal Navy, which maintains a continuous at-sea presence via its four Vanguard-class nuclear-powered submarines. At any one time, at least sixty-four of the UK's nuclear weapons are somewhere at sea, ready to launch within minutes of warning. The Trident D5 missile is deployed by both the United States and United Kingdom on their respective Ohio- and Vanguard-class nuclear missile submarines. The UK Navys forthcoming Dreadnought-class submarine will equip the Trident D5 as it enters service in the early 2030s. This maximizes the submarines strategic availability, reduces the number of submarines required to meet strategic requirements and allows for proper crew training, readiness and morale. The Ohio-class boats entered service in the 1980s as a replacement for five different classes of fleet ballistic-missile submarines, collectively known as the 41 for Freedom. Displacing more than eighteen thousand tons submerged, the new boomers remain the largest submarines to serve in the U.S. Navyand the third largest ever built. Arms are sea-based and carried by Trident submarine-launched ballistic missiles . Unlike Lafayette and Le Redoutable, the new submarines of the Royal Navys Resolution-class would have their hydroplanes on the bow, with the ability to fold up when parked along a pier. The ULMS II missile system was designed to be retrofitted to the existing SSBNs, while also being fitted to the proposed Ohio-class submarine. The B-2 bombers can carry 16 gravity bombs, while the B-52 bombers carry 20 cruise missiles, each equipped with one warhead. The U.S. Navy released no official details concerning Missile Threat brings together a wide range of information and analyses relating to the proliferation of cruise and ballistic missiles around the world and the air and missile defense systems designed to defeat them. While nowhere near as powerful as the U.S. strategic deterrent, the nuclear weapons are more than enough to prevent any opponent from launching a surprise attack. The Guidance System for the missile was developed by the Charles Stark Draper Laboratory and is maintained by a joint Draper/General Dynamics Mission Systems facility. Each submarine can carry 16 missiles and are equipped with UK warheads believed to be similar to the W76 100 kT US warheads. Sagarika is a submarine-launched ballistic missile with a range of 700 km. With inertial guidance refined by stellar or satellite navigation, Tridents are more accurate than most land-based ballistic missiles. The first version, the Trident I, or C-4, was 34 feet (10.4 m) long and 6 feet (1.8 metres) in diameter. Resolution first successfully launched a missile off the coast of Florida in February 1968. [12], In 2002, the United States Navy announced plans to extend the life of the submarines and the D5 missiles to the year 2040. The Trident II, which is . France mainly breaks with the UK on nuclear weapons in that they have 50 or so aircraft that can launch missiles with a range of about 300 miles that deliver nuclear warheads, according to Kristensen. It is called the "new START". Each submarine has two crews, Blue and Gold, which alternate manning the submarines and taking them on patrol. Trident missiles are carried by fourteen United States Navy Ohio-class submarines, with American warheads, as well as four Royal Navy Vanguard-class submarines, with British warheads. The result were the four Vanguard-class submarines: Vanguard (commissioned in 1993), Victorious (1995), Vigilant (1996) and Vengeance (1999). [22] Russian President Vladimir Putin, among others, warned that the project would increase the danger of accidental nuclear war. The five-decade-old Minuteman III will be replaced by the $100 billion. The B-21 Raider will first supplement, then eventually replace, the B-2 beginning in the mid-2020s. [9] There have been fewer than 10 test flights that were failures,[10] the most recent being from HMSVengeance, one of Britain's four nuclear-armed submarines, off the coast of Florida in June 2016. Missile Threat is a product of the Missile Defense Project at the Center for Strategic and International Studies. We will meet those challenges and we stand ready to keep the peace and, if necessary, win the war on the land, at sea, in the air, in space and cyberspace.". America's ICBM force has remained on continuous, around-the-clock alert since 1959. Defence Secretary Ben Wallace is calling on the US to back spending on the new W93 warhead. Im referring, of course, to ballistic-missile submarines, or boomers in U.S. Navy parlance. Originally developed by Lockheed Missiles and Space Corporation, the missile is armed with thermonuclear warheads and is launched from nuclear-powered ballistic missile submarines (SSBNs). Trident is Britain's nuclear weapons system. America's ICBM force has remained on continuous, around-the-clock alert since 1959. Nuclear weapons delivery is the technology and systems used to place a nuclear weapon at the position of detonation, on or near its target. 1 How many warheads are on a Trident missile? The aerospike, a telescoping outward extension that halves aerodynamic drag, is then deployed, and the boost phase begins. Beginning in 1979, Trident I missiles were fitted aboard older U.S. Poseidon-carrying submarines and newer Ohio-class vessels. However, China, Russia, India, England and France all operate multiple ballistic-missile submarines with varying missile armamentsand even a few such submarines would suffice to annihilate the major cities in a developed nation. UK missile submarine crews, like their American counterparts, maintain two crews per boat to increase ship availability. Minuteman was a revolutionary concept and an extraordinary technical achievement. Sagarika has . Each sub carries up to eight missiles on board, and each missile carries up to five nuclear bombs - or warheads - on top. The Royal Navys ballistic missile submarines carry on the services centuries-old mission of protecting the country from the sea. Only the H model is still in the Air Force inventory. Contractor: Boeing Military Airplanes Co. Power Plant: Eight Pratt & Whitney engines TF33-P-3/103 turbofan, Weight: ~185,000 pounds / 83,250 kilograms, Maximum takeoff weight: 488,000 pounds / 219,600 kilograms, Fuel Capacity: 312,1970 pounds / 141,610 kilograms, Payload: 70,000 pounds / 31,500 kilogramst, Range: 8,800 miles / 7,652 nautical miles, Armament: ~70,000 pounds / 31,500 kilograms mixed ordnance - bombs, mines and missiles (modified to carry air-launched cruise missiles), Crew: Five - aircraft commander, pilot, radar navigator, navigator and electronic warfare officer, Unit Cost: $84 million / fiscal 2012 constant dollars, Inventory: Active Force - 58 | Reserve - 18 | Air National Guard - 0. The warheads are W-76 100-kiloton or W-88 455- kiloton bombs. How many nuclear warheads can a Trident missile carry? Improved air-burst fuses were considered for the Mk 4 RV in 1998. Skybolts cancellation threatened to undo the UKs entire nuclear deterrent, and the two countries raced to come up with a solution. The U.S. Navy has deployed a new type of "low-yield" nuclear warhead in some of its Trident submarines . The Trident D5 missile is deployed by both the United States and United Kingdom on their respective Ohio- and Vanguard-class nuclear missile submarines. [23], This article is about the Trident missile. Ballistic missile submarines or boomers are undetectable platforms for submarine-launched ballistic missiles. Trident missiles are deployed in four submarines, one of which is continuously at sea to make sure it can strike back in the event of an unprovoked nuclear attack. However, by now all of the boomers are armed with the superior Trident IID5ballistic missile, which has 50 percent greater range and is capable of very accurate strikes, which could enable them to precisely target military installations as a first-strike weapon. Fourteen Ohio-class SSBNs make up the most survivable leg of the nuclear triad. Each Trident missile can carry up to eight nuclear warheads, but usually carry four to five for an average of 90 warheads per submarine. The pool is 'co-mingled' and missiles are selected at random for loading on to either nation's submarines. The first eight Ohio-class boats were originally built to launch the Trident I C4 ballistic missilean advanced version of the earlier Poseidon SLBM. The Arms Control Association (ACA) in November 2021 said Russian forces . For that reason among others, this project raised a substantial debate before US Congress for the FY07 Defense budget, but also internationally. The Royal Navy's nuclear submarine - HMS Vanguard - is 150 metres long. While every effort has been made to follow citation style rules, there may be some discrepancies. The CSIS Missile Defense Projects monthly newsletter has info on the projects latest publications, events, and missile defense news. The UK deploys 16 Trident missiles on each of its four Vanguard-class submarines, of which one is on patrol at all times. Night vision goggles provide greater safety during night operations by increasing the pilot's ability to visually clear terrain, to increase the peacetime and combat situational awareness of the aircrew and visually acquire other aircraft. BrahMos So currently the US Trident II missiles are armed with 8 warheads with a 475 kT yield each. A 2016 report notes that nine Ohio-class submarines are deployed in the Pacific and five in the Atlantic.12, The Navys forthcoming Columbia-class submarine will equip the Trident D5 as it enters service in the early 2030s. Most modern design support Multiple Independently targetable Re-entry Vehicles (MIRVs). While the C4, formerly known as EXPO (Extended Range Poseidon), is just an improved version of the Poseidon C-3 missile, the Trident II D-5 has a completely new design (although with some technologies adopted from the C-4). The UK again decided to build its own submarines and outfit them with American missiles. We use cookies to ensure that we give you the best experience on our website. Fairchild Air Force Base played a role in the 1962 Cuban Missile Crisis. Strategic Systems Programs The same Congressional report noted that, based on the projected procurement schedule, the first Columbia- class submarine will be delivered by 2028 and become operational by 2031, at a total cost of $8.4 billion . The missiles are ejected from their tubes by igniting an explosive charge in a separate container. The Ground-Based Strategic Deterrent program will begin the replacement of Minuteman III and modernization of the 450 ICBM launch facilities in 2029. The energy from the blast is directed to a water tank, where the water is flash-vaporized to steam. General Electric Aircraft Engine Group and Vought Aircraft Industries Inc. In the United States' current nuclear arsenal, the most powerful bomb is the B83, which has a maximum yield of 1.2 megatons, making it 60. Each of the 170-meter-long vessels can carry twenty-four Trident II submarine-launched ballistic missiles (SLBMs) which can be fired from underwater to strike at targets more than seven thousand miles away depending on the load. It is the sole strategic-range nuclear weapon of the United Kingdom and constitutes the sea-based leg of the United States nuclear forces. And the bomb dropped on Nagasaki killed more than 70,000 people. During Desert Storm, B-52s delivered 40 percent of all the weapons dropped by coalition forces. An intercontinental ballistic missile (ICBM) is a ballistic missile with a range greater than 5,500 kilometres (3,400 mi), primarily designed for nuclear weapons delivery (delivering one or more thermonuclear warheads). How many nuclear warheads can a Trident missile carry? It can carry nuclear or precision guided conventional weapons with worldwide precision navigation. The Navy began developing the Trident D5 in March 1980. In 2007, Lockheed Martin was awarded a total of $848 million in contracts to perform this and related work, which also includes upgrading the missiles' reentry systems. The first eight Ohio-class submarines were built with the Trident I missiles. The second variant of the Trident is more sophisticated and can carry a heavier payload. [17] This was almost exactly 22 years after the first Trident II missile was launched from Tennessee in February 1990. This leaves open the likelihood that other nuclear-armed countries might mistake it for a nuclear launch which could provoke a counterattack. The United Kingdom maintains a fleet of four ballistic missile submarines with the ability to devastate even the largest of countries. Occasionally, these chaps will spawn into the world holding a trident, so you simply have to defeat them for a chance of a trident dropping, but that chance is very small at 8.5%. The first aircraft, Spirit of Missouri, was delivered Dec. 17, 1993. If you do the math, the Ohio-class boats may be the most destructive weapon system created by humankind. Boeing Military Airplanes Co., Hughes Radar Systems Group, General Electric Aircraft Engine Group and Vought Aircraft Industries Inc., are key members of the aircraft contractor team. The UGM-133 Trident II D5 is the U.S. Navys latest generation submarine-launched ballistic missile (SLBM). Trident II missiles are carried by 14 US Ohio and four British Vanguard -class submarines, with 24 missiles on each Ohio class and 16 missiles on each Vanguard class (the number of missiles on Ohio -class submarines will be reduced to 20 each starting in 2023, in compliance with the New Strategic Arms Limitation Treaty). The Trident II was the original missile on the British Vanguard-class and American Ohio-class SSBNs from Tennessee on. Since 2007, when MPs backed plans to renew the Trident fleet by 409 votes to 61, "conceptual" work has been going on . A Trident submarine off the coast of Southern California in 2004. The main aim is to replace obsolete components at minimal cost[citation needed] by using commercial off the shelf (COTS) hardware; all the while maintaining the demonstrated performance of the existing Trident II missiles. Point of Contact Updated with modern technology the B-52 will be capable of delivering the full complement of joint developed weapons and will continue into the 21st century as an important element of our nation's defenses. While nowhere near as powerful as the U.S. strategic deterrent,. The Minuteman weapon system was conceived in the late 1950s and Minuteman I was deployed in the early 1960s. The United Kingdom is estimated to possess 225 nuclear weapons, of which 120 are operationally available and only 40 are deployed at a time. The missiles, launched from Ohio-class submarine USS Wyoming (SSBN-742), landed in the Atlantic Ocean within the U.S. Eastern Test Range instrumented complex. Project Type Fleet ballistic missile Manufacturer Lockheed Martin Operators US Navy and Royal Navy First Deployment 1990 Weight 58,500kg Expand The Ohio submarines were built with larger missile tubes designed to accommodate the newer Trident II beginning in 1990. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. The B-52 is capable of dropping or launching the widest array of weapons in the U.S. inventory. 2023 Center for Strategic and International Studies. A 1999 UK statement limited the number of warheads to be deployed on each submarine to 48, an average of 3 warheads per missile.14 In July 2016, Parliament voted to approve new SSBNs to preserve the UK nuclear deterrent, ensuring that Trident will be deployed into 2050s.15. The logic of nuclear deterrence: while a first strike might wipe out a countrys land-based missiles and nuclear bombers, itsverydifficult to track a ballistic-missile submarine patrolling quietly in the depths of the oceanand theres little hope of taking themallout in a first strike. In March 2021, the UK government announced it would increase its number of warheads . From Sept. 2 to 3, 1996, two B-52H's struck Baghdad power stations and communications facilities with 13 AGM-86C conventional air launched cruise missiles, or CALCMs, as part of Operation Desert Strike. For three days the rooms are filled with a multitude of companies and government agencies from around the country connected to the Department of Energy, Department of Defense, and National Nuclear Security Administration that make up . The Trident missile rises into space above missile defense systems and releases the MIRVs. Warren Air Force Base, Wyoming; the 341st Missile Wing at Malmstrom Air Force Base, Montana; and the 91st Missile Wing at Minot Air Force Base, North Dakota. The Trident II D-5 has a range of 4,600 miles, meaning it can strike targets across European Russia with ease. On average, the submarines spend 77 days at sea followed by 35 days in port for maintenance. A compilation of platforms and weapons, the three legs of the U.S. nuclear triad serve as the backbone of Americas national security. Re-entry vehicles maneuver in order to avoid enemy air defenses. 2 How many missiles does a Trident submarine carry? Hard to take out. Each will have twelve missile tubes instead of sixteen, and the subs will recycle the Trident II D-5 missiles from their predecessors. Since the end of the Cold War, each U.S. President has directed their administration to create a Nuclear Posture Review (NPR) outlining the role of U.S. nuclear weapons. In addition, it can carry the conventional cruise missile that was launched in several contingencies during the 1990s and 2000s, starting with Operation Desert Storm and culminating with Operation Iraqi Freedom. This article was most recently revised and updated by, https://www.britannica.com/technology/Trident-missile. Copyright 2023 Center for the National Interest All Rights Reserved, Polaris A-3 submarine-launched ballistic missiles. and SLBMs.1 All the missiles still carry nuclear warheads. No explosive is said to be used since the reentry vehicle's mass and hypersonic impact velocity provide sufficient mechanical energy and "effect". Ohio-Class Ballistic Missile Submarines - SSBN. The end of the Cold War, and especially the Strategic Arms Reduction Treaty, resulted in the downsizing of U.S. nuclear forces. B-52s struck wide-area troop concentrations, fixed installations and bunkers, and decimated the morale of Iraq's Republican Guard. The Ground-Based. Since the conclusion of the weapons testing in the 1980s, radionuclides in the atmosphere have largely decayed away. Phone: 202.546.0795, 2023 Center for Arms Control and Non-Proliferation Trident I (designated as C4) was deployed in 1979 and retired in 2005. The United States total nuclear inventory is 5,550, with around 3,800 active warheads in the stockpile and another 1,750 retired warheads awaiting dismantlement. These weapons are deployed on air, sea, and land platforms in what is referred to as The Triad.. Pilots wear night vision goggles, or NVG, to enhance their vision during night operations. There may be an additional need to conduct end-to-end tests of Trident D5s that reflect the introduction of the new W76-2 low-yield warhead for those missiles, the last examples of which were . They write new content and verify and edit content received from contributors. The warheads are either the 90-kiloton W76-1 or the 455-kiloton W88. How many missiles does a Trident submarine carry? Through various arms control agreements and unilateral reductions, the United States has atotal inventory of around 5,550nuclear warheads. How many Trident II missiles are on a Vanguard class submarine? The Trident can be fired at targets up to 4,000 miles away, ejected by high-pressure gas before the rockets fire when the missile reaches the surface. How many nuclear weapons does the UK currently possess? The Navy plans to deploy 12 Columbia-class submarines, each carrying 16 Trident D5 missiles in four quad packs.13, In 1994, the United Kingdom began equipping the Trident D5 aboard its four Vanguard-class missile submarines. Dont worry, restless hawks: thats still enough to destroy the world several times over! 4. The subsequent pressure spike is strong enough to eject the missile out of the tube and give it enough momentum to reach and clear the surface of the water. The combat effectiveness of the B-2 was proved in Operation Allied Force, where it was responsible for destroying 33 percent of all Serbian targets in the first eight weeks, by flying nonstop to Kosovo from its home base in Missouri and back. The British Trident IIs are reported to carry an average of three 100-kiloton warheads each, while the U.S. missiles are variously reported as carrying four, six, eight, or even more 475-kiloton warheads. [21] It offered the promise of accurate conventional strikes with little warning and flight time. Each warhead has approx 400kt of explosive yield (explosive power equivalent to 400,000 tonnes of TNT). The specified mission trajectory is loaded onto the flight computer. The missile is named after the mythological trident of Neptune.[1]. The first flight test of a D-5 LE subsystem, the MK 6 Mod 1 guidance system, in Demonstration and Shakedown Operation (DASO)-23,[16] took place on USSTennessee on 22 February 2012. At its fastest, it will travel at over 13,000 miles an hour. . This number would later be reduced to four submarines. It could deliver eight independently targetable 100-kiloton nuclear warheads to a range of 4,000 nautical miles (7,400 km). [4] Under the agreement, the United Kingdom paid an additional 5% of their total procurement cost of $2.5 billion to the US government as a research and development contribution. The Trident II, or D-5, is about 46 feet (14 metres) long and carries multiple independently targeted warheads. So 12 missiles gives us 96 warheads. . Thus, ballistic-missile submarines promise the unstoppable hand of nuclear retributionand should deter any sane adversary from attempting a first strike or resorting to nuclear weapons at all. There have been 172 successful test flights of the D5 missile since design completion in 1989, the most recent being from USSRhode Island in May 2019. An average of a month is spent between patrols, with resupply facilitated by three large-diameter supply hatches. This is a. 820 1st Street NE, Suite LL-180 Strategic Systems Programs According to an official notice to mariners, the missile was scheduled to fly over 8,000 km to a designated area in the South Atlantic Ocean. In 1971, the US Navy began studies of an advanced Undersea Long-range Missile System (ULMS). The B-2 Combined Test Force, Air Force Flight Test Center, Edwards Air Force Base, California, is responsible for flight testing the engineering, manufacturing and development aircraft on the B-2. He currently writes on security and military history forWar Is Boring. It could deliver eight independently targetable 100-kiloton nuclear warheads to a range of 4,000 nautical miles (7,400 km). Its low-observable, or "stealth," characteristics give it the unique ability to penetrate an enemy's most sophisticated defenses and threaten its most valued, and heavily defended, targets. Corrections? The United Kingdoms nuclear force in the early 1960s relied upon the so-called V-Force strategic bombers: the Avro Vulcan, Handley Page Victor and Vickers Valiant. Under development from the late 1960s, the Trident developed into two models. In short, a full salvo from an Ohio-class submarinewhich can be launched in less than one minutecould unleash up to 192 nuclear warheads to wipe twenty-four cities off the map. When the third-stage motor fires, within two minutes of launch, the missile is traveling faster than 20,000ft/s (6,000m/s), or 13,600mph (21,600km/h) Mach 18. [3] British Prime Minister Margaret Thatcher wrote to President Carter on 10 July 1980, to request that he approve supply of Trident I missiles. The missiles, missile launch tubes and fire control mechanisms, however, were built in the United States. On Feb. 1, 2009, the Air Force's newest command, Air Force Global Strike Command, assumed responsibility for the B-2 from Air Combat Command. deployment of conventional warheads on Trident missiles, which might be deployed in 2-4 years, but the 109th Congress rejected most of this request. At that time, this was the longest distance flown for a combat mission involving a 34-hour, 16,000 statute mile round trip from Barksdale Air Force Base, Louisiana. Modernization programs have resulted in new versions of the missile, expanded targeting options, and improved accuracy and survivability. In recent years, analysts both inside and outside the government have suggested that the United . Primary Function: Intercontinental Ballistic Missle, Date Deployed: June 1970, production cessation: December 1978, Power Plant: Three solid-propellant rocket motors, First Stage: ATK refurbished M55A1 | Second Stage: ATK refurbished SR-19 | Third Stage: ATK refurbished SR-73, Range: 6,000+ miles / 5,218 nautical miles, Speed: ~15,000 mph / Mach 23 or 24,000 kph at burnout, Inventory: Active Force - 406 | Reserve - 0 | Air National Guard - 0. An extensive upgrade for 300 missiles is planned in 2020 in order to upgrade them to the Trident D-5A or D-5LE versions with improved capabilities and an extended service life to 2042.3, In the mid-2000s, the Defense Department requested to deploy conventionally-armed Trident D5 missiles to satisfy requirements for its Conventional Prompt Global Strike capability.