Strategic Defense Initiative

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Strategic Defense Initiative

(SDI), former U.S. government program responsible for research and development of a space-based system to defend the nation from attack by strategic ballistic missiles (see guided missileguided missile,
self-propelled, unmanned space or air vehicle carrying an explosive warhead. Its path can be adjusted during flight, either by automatic self-contained controls or remote human control. Guided missiles are powered either by rocket engines or by jet propulsion.
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). The program is now administered by the Missile Defense Agency (originally the Strategic Defense Initiative Office), a separate agency in the U.S. Dept. of DefenseDefense, United States Department of,
executive department of the federal government charged with coordinating and supervising all agencies and functions of the government relating directly to national security and military affairs.
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. SDI, popularly referred to as "Star Wars," was announced by President Ronald Reagan in a speech in Mar., 1983, and was derided by critics as unrealistic. Space programs from other agencies and services were brought together in the organization. It has investigated many new technologies, including ground-based lasers, space-based lasers, and automated space vehicles. Critics argued that the original SDI program would encourage the militarization of space and destabilize the nuclear balance of power, and was technologically infeasible, based on untested technologies, and unable to defend against cruise missilescruise missile,
low-flying, continuously powered offensive missile designed to evade defense systems. Although the German V-1 (1944) was a simple cruise missile, the cruise missile did not realize its potential until the 1970s, when the United States sought to develop a
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, airplanes, or several other possible delivery systems. In addition, some countermeasures to SDI technologies, such as decoy missiles and shielding of armed missiles, would be simple to implement. In 1987 the Soviet Union revealed it had a similar program.

The end of the cold warcold war,
term used to describe the shifting struggle for power and prestige between the Western powers and the Communist bloc from the end of World War II until 1989. Of worldwide proportions, the conflict was tacit in the ideological differences between communism and
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 led to criticism that SDI was unnecessary, and in 1991 President G. H. W. BushBush, George Herbert Walker,
1924–, 41st President of the United States (1989–93), b. Milton, Mass., B.A., Yale Univ., 1948. Career in Business and Government
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 called for a more limited version using rocket-launched interceptors based on the ground at a single site. In 1993, SDI was reorganized as the Ballistic Missile Defense Organization (BMDO). The more limited system, called the National Missile Defense (NMD), is intended to protect all 50 states from a rogue missile attack, but the deployment of such a system was forbidden under the 1972 Anti-Ballistic Missile (ABM) Treaty. Russia opposed the NMD plan but, under President Putin, also proposed a mobile, pan-European missile defense system with a similar purpose that would not violate the ABM treaty.

In 2001, President George W. BushBush, George Walker,
1946–, 43d President of the United States (2001–9), b. New Haven, Conn. The eldest son of President George H. W. Bush, he was was raised in Texas and, like his father, attended Phillips Academy in Andover, Mass., and Yale, graduating in 1968.
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 called for accelerated development of the NMD system, and subsequently withdrew from the ABM treaty to permit the system's development and deployment. Apparently successful early tests of the U.S. system were later revealed to have occurred after the odds of success had been enhanced (1984, 1991). Subsequent tests were generally more successful, although flawed or limited in certain respects, but tests in 2002, 2004, and 2005 involved failures. In 2002, President Bush ordered the deployment of a modest missile defense system by 2004, with interceptors based at sea (in the Pacific and, to a lesser degree, the Atlantic) and at Fort Greely, Alaska, and Vandenberg Air Force Base, Calif., and several interceptor missiles were emplaced by the end of 2004. Also in 2002, the BMDO was renamed the Missile Defense Agency (MDA). In addition to NMD, the MDA is also working to develop missile defenses for the battlefield as part of the Theater Missile Defense program. In 2007 the MDA reported that, although missile defense system was still under development and not officially operational, it was ready for use.

Antimissile systems stationed in Poland and Czech Republic were also proposed, and agreements signed with those nations in 2008; Russia objected strongly to the proposal. Those plans were abandoned (2009) under President Barack ObamaObama, Barack
(Barack Hussein Obama 2d), , 1961–, 44th president of the United States (2009–17), b. Honolulu, grad. Columbia (B.A. 1983), Harvard Law School (J.D. 1991).
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, who proposed stationing interceptor missiles in SE Europe. In Nov., 2011, NATO agreed to establish a missile defense system that would incorporate the U.S. interceptors and protect all member nations. Russia was invited to participate but continued to oppose the revised plan. Under the plan, missile interceptors have been based at sea since 2011; a radar site in Turkey and command facilities at Ramstein, Germany, became operational in 2012 and a land-based missile interceptor site in Romania was completed in 2015. Israel has also developed a ballistic missile defense system as part of a broader program to protect the country against missile attacks.


See studies by S. Lakoff and H. York (1989) and F. FitzGerald (2000).

Strategic Defense Initiative

A U.S. high-tech anti-ballistic missile defense system proposed during the Reagan administration in the 1980s. Also called "Star Wars."
References in classic literature ?
More obvious, more prominent, shone on by the full light of the large window, were the occupants of the benches just before me, of whom some were girls of fourteen, fifteen, sixteen, some young women from eighteen (as it appeared to me) up to twenty; the most modest attire, the simplest fashion of wearing the hair, were apparent in all; and good features, ruddy, blooming complexions, large and brilliant eyes, forms full, even to solidity, seemed to abound.
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Not bad," he repeated, turning his dewy, brilliant eyes from Levin to the Tatar.
There were a couple of officers, friends of Granet's, back from the Front on leave; Lady Conyers, with Geraldine and Olive; Granet himself; and a tall, dark girl with pallid complexion and brilliant eyes, who had come with Lady Anselman and who was standing now by her side.
Owen Ford listened, with his head on his hand, and the First Mate purring on his knee, his brilliant eyes fastened on Captain Jim's rugged, eloquent face.
At this door, in the embrasure of which he was leaning, he saw, standing out strongly, a figure with a brown and lofty countenance, an aquiline nose, a stern but brilliant eye, gray and long hair, a black mustache, the true type of military beauty, whose gorget, more sparkling than a mirror, broke all the reflected lights which concentrated upon it, and sent them back as lightning.