The Aegis combat system is an integrated weapons system used by the United States Navy. It is both an integrated single ship system and a ship-to-ship network. The Aegis combat system is one of the most advanced and most capable defense systems currently in use. It is also used by the Japan Maritime Self-Defense Force, Spanish Navy, Royal Norwegian Navy, and Republic of Korea Navy. The, or JMSDF, is the maritime branch of the Japan Self-Defense Forces, tasked with the naval defense of Japan. The Royal Norwegian Navy (often abbreviated as RNoN) is the branch of the Norwegian Defence Force responsible for naval operations The Republic of Korea Navy ( Hangul: 대한민국 해군 Hanja: 大韓民國 海軍 Revised Romanization: Dae-han-min-guk Hae-gun) or The Royal Australian Navy has selected the Aegis system for placement on their new destroyers. The Royal Australian Navy ( RAN) is the naval branch of the Australian Defence Force. A total of 108 Aegis-equipped ships have been deployed in five navies worldwide.
Aegis was initially developed by the Missile and Surface Radar Division of RCA, which was then acquired by General Electric. The division responsible for the Aegis systems became Government Electronic Systems. This, and other GE Aerospace businesses, were sold to Martin Marietta in 1992. Martin Marietta Corporation was founded in 1961 through the Merger of The Martin Company and American-Marietta Corporation.  This became part of Lockheed Martin in 1995. Lockheed Martin ( is a large multinational Aerospace manufacturer and advanced technology Company formed in 1995 by the merger of
The Aegis weapon system is an advanced combat, control, and information system that uses powerful computers and radars to track and destroy enemy targets. It is the most advanced modern combat system and is the first fully integrated combat system built to defend against air, surface, and subsurface threats.
The Aegis Weapons System comprises the SPY-1 Radar, MK 99 Fire Control System and ORTS, MK 41 VLS, the Command and Decision Suite, and SM-2 Standard Missile systems. A Vertical Launching System ( VLS) is a type of Missile -firing system used aboard the Submarines and surface vessels of several navies around the Shipboard torpedo and naval gunnery systems are also integrated.  The Aegis combat system is controlled by an advanced, automatic detect-and-track, multi-function three-dimensional passive electronically scanned array radar, the AN/SPY-1. A passive electronically scanned array (PESA as opposed to its active counterpart AESA, is a Phased array which has a central radiofrequency Radar is a system that uses electromagnetic waves to identify the range altitude direction or speed of both moving and fixed objects such as Aircraft, ships Known as "the Shield of the Fleet", the SPY high-powered (four megawatt) radar is able to perform search, tracking, and missile guidance functions simultaneously with a track capacity of well over 100 targets at more than 100 nautical miles (190 km). The watt (symbol W) is the SI derived unit of power, equal to one Joule of energy per Second. 
The Aegis system uses missile uplink using the AN/SPY-1 radar for midcourse guidance of Standard missiles during engagements, but still requires the AN/SPG-62 radar for terminal guidance. This means that with proper scheduling of intercepts, a large number of targets can be engaged simultaneously.
The computer-based command-and-decision element is the core of the Aegis combat system. A computer is a Machine that manipulates data according to a list of instructions. This interface makes the Aegis combat system capable of simultaneous operation against almost all kinds of threats. The Aegis system is being enhanced to act in a Theater Missile Defense role, to counter short- and medium-range ballistic missiles of the variety typically employed by rogue states (see Aegis Ballistic Missile Defense System). A ballistic missile is a Missile that follows a Sub-orbital ballistic flightpath with the objective of delivering a warhead to a predetermined target The Aegis Ballistic Missile Defense System is a United States Department of Defense Missile Defense Agency program developed to provide a last line of defense
By the late 1950s, the US Navy replaced guns with guided missiles on its ships. History 1980s The Vincennes was the first of the Ticonderoga -class cruisers to enter the Pacific Fleet. These were sufficient weapons but by the late 1960s, the U. S. Navy recognized that reaction time, firepower, and operational availability in all environments did not match the anti-ship missile threat.
As a result, the US Navy decided to develop a program to defend ships from anti-ship missile threats. An Advanced Surface Missile System (ASMS) was promulgated and an engineering development program was initiated to meet the requirements. ASMS was re-named "Aegis" in December 1969 after the aegis, the shield of the Greek god Zeus. "Aegis" (ˈiːdʒɨs has entered modern English to mean a shield protection or sponsorship originally from the name of the mythological protective shield of Zeus A shield is a protective device meant to intercept attacks The term often refers to a device that is held in the hand as opposed to Armour or a Bullet proof vest Greek mythology is the body of stories belonging to the ancient Greeks concerning their gods and Heroes the nature of the world and the origins and significance Zeus (zjuːs in Greek: nominative: Zeús /zdeús/ genitive: Diós; Modern Greek /'zefs/ in Greek mythology The name was coined at the suggestion of Captain L. J. Stecher, a former Tartar Weapon System manager, after an internal U. Description The Tartar Guided Missile Fire Control System, or Mk 74 Guided Missile Fire Control System or just Tartar, is a US-built medium-range anti-aircraft S. Navy contest to name the ASMS program was initiated. Captain Stecher also submitted a possible acronym of Advanced Electronic Guided Interceptor System although this definition was never used.  While many other meanings have been attributed to the name Aegis, the name is not an acronym. The main manufacturer of the Aegis combat system, Lockheed Martin, makes no mention of it being an acronym, nor does the U.S. Navy. Lockheed Martin ( is a large multinational Aerospace manufacturer and advanced technology Company formed in 1995 by the merger of
The first Engineering Development Model (EDM-1) was installed in a test ship, the USS Norton Sound, in 1973. Career Norton Sound (AV-11 was laid down 7 September 1942; launched 28 November 1943; sponsored by Mrs This was the first fully-operational seaborne phased-array RADAR. The Navy built the first Aegis-equipped cruisers using the hull and machinery designs of Spruance-class destroyers. A cruiser is a large type of Warship, which had its prime period from the late 19th century to the end of the Cold War. Class The class was designed for anti-submarine warfare (ASW with point defense Anti-aircraft warfare (AAW missiles upgrades provided anti-ship and land attack The first cruiser of this class was the Ticonderoga, which uses two twin-armed Mark-26 missile launchers, fore and aft. History of the ship The United States Navy built the first Aegis Cruisers using the hull and machinery designs of ''Spruance''-class destroyers. The commissioning of the sixth ship of the class, the Bunker Hill opened a new era in surface warfare as the first Aegis ship outfitted with the Martin Marietta Mark-41 Vertical Launching System (VLS), allowing a wider missile selection, more firepower, and survivability. In Fiction Bunker Hill was featured in Tom Clancy 's 1986 novel Red Storm Rising. Martin Marietta Corporation was founded in 1961 through the Merger of The Martin Company and American-Marietta Corporation. A Vertical Launching System ( VLS) is a type of Missile -firing system used aboard the Submarines and surface vessels of several navies around the The improved AN/SPY-1B radar went to sea in the Princeton, ushering in another advance in Aegis capabilities. Mine Attack On the morning of 18 February 1991 during Operation Desert Storm, Princeton was patrolling an operating area 28 nautical miles off Failaka The Chosin introduced the AN/UYK-43/44 computers, which provide increased processing capabilities.
In 1980, a destroyer was designed using an improved sea-keeping hull form, reduced infrared, and radar cross-section and upgrades to the Aegis Combat System. Infrared ( IR) radiation is Electromagnetic radiation whose Wavelength is longer than that of Visible light, but shorter than that of The first ship of the Arleigh Burke class, the USS Arleigh Burke, was commissioned in 1991. Characteristics The Arleigh Burke class are among the largest and most powerful destroyers ever built both larger and more heavily armed than many previous cruisers History Even before the USS Arleigh Burke was commissioned the Commander Operational Test and Evaluation Force was involved in the initial phases of testing Because the Aegis system dominates the ship's architecture, ships equipped with it are sometimes mistakenly called Aegis class ships.
Flight II of the Arleigh Burke class, introduced in 1992, incorporated improvements to the SPY radar, and to the Standard missile, active electronic countermeasures, and communications. Flight IIA, introduced in 2000, added a helicopter hangar with one anti-submarine helicopter and one armed attack helicopter. History Since 400 AD Chinese children have played with bamboo flying toys. The Aegis program has also projected reducing the cost of each Flight IIA ship by at least $30 million.
The Aegis system was involved in an incident in which USS Vincennes shot down Iran Air Flight 655 in 1988 resulting in 290 civilian deaths. History 1980s The Vincennes was the first of the Ticonderoga -class cruisers to enter the Pacific Fleet. Iran Air Flight 655, also known as IR655, was a civilian Airliner shot down by US missiles on Sunday July 3, 1988, over
It was determined by a formal military investigation that the Aegis system was fully operational and did not have any maintenance issues. The investigation ruled that had the Commanding officer relied on the full tactical data displayed by the Aegis system, (i. The commanding officer ( CO) is the officer in command of a Military unit. e. Doctrine), the engagement might never have occurred. Additionally, psychological effects of the crew subconsciously manipulating the data to fit a predefined scenario greatly contributed to the false identification. The investigation found that the Aegis Combat System did not contribute to the incident, but did aid in the investigation by means of recorded target data. The discrepancies are as follows:
|Aegis Data Report||Personnel Report To CO|
|Iran Air Flight 655 continuously ascended in duration of flight||Iran Air Flight 655, after attaining 9000 to 12,000 ft (3,700 m). Iran Air Flight 655, also known as IR655, was a civilian Airliner shot down by US missiles on Sunday July 3, 1988, over Iran Air Flight 655, also known as IR655, was a civilian Airliner shot down by US missiles on Sunday July 3, 1988, over , reportedly descended on an attack vector on USS Vincennes|
|Iran Air Flight 655 continuously squawked Mode III (Civilian Airliner) IFF in duration of flight||Iran Air Flight 655 reportedly squawked Mode II (Iranian F-14 Tomcat) IFF momentarily, personnel proceeded to label the target from "Unknown Assumed Enemy" to "F-14"|
|Iran Air Flight 655 held consistent climb speed in duration of flight||Iran Air Flight 655 was reported to increase in speed to an attack vector similar to an F-14 Tomcat|
|Ship Class||Operator||Total Ships|
|King Sejong the Great||ROKN||1|
|Álvaro de Bazán||AE||5|