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Strategic Defense Initiative
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The Strategic Defense Initiative, also known as SDI or the "Star Wars" program (1984-1993), was the batshit brainchild of the Reagan administration, perhaps based on a movie Reagan himself once saw. The basic plan was to build a defense system against nuclear attack, in violation of arms control treaties signed with the USSR. In the most fanciful versions imagined, this involved "exotic" space-based lasers/rockets destroying missiles soon after launch. While all of this was supposedly deemed possible, the technology that exists today — let alone 32 years ago when SDI was announced — is nowhere near precise enough to pull it off. However, the idea took hold with certain paranoid types who were convinced that the US could not depend on the Soviets acting rationally. Not to mention assorted organizations and people who knew a gravy train when they saw one: some just to stick their noses in the trough, others to get funding for serious research.
The standard conservative retcon is that this clearly unworkable idea: a) contributed to other technological advancements that just couldn't have been done in any other context, or b) was in fact a fantastically clever ruse to get the Soviets to spend more than they could afford on defending against this defense — that everyone in power in the Soviet Union was stupid enough to assume this clearly unworkable idea was workable and take it seriously — and that Reagan therefore caused the collapse of Communism personally. Brilliant!
 Why it was outlawed to begin with
Many Americans are surprised to learn that the US and USSR had signed treaties to outlaw these kinds of "shield" programs (they assume that anything "defensive" in nature must be a good thing). However, deterrence theorists realized by the 1960s that the only way to prevent nuclear war was to make sure that no nation would be willing to risk an attack on another nuclear power. This idea was known as "mutually assured destruction" (sometimes ridiculously acronymized as "MAD"). If the US attacked the USSR, or vice versa, the US could not be certain to destroy all of the USSR's nuclear missiles and prevent a retaliation strike. Similarly, with so much of the US's nuclear capacity stationed in off-shore submarines, the Soviets could not destroy the American second-strike capability. Therefore, any nuclear attack would be suicide.
To this end, anything that could protect a state from the risk of retaliation was considered bad. Even a system that was only 10 or 20% effective was risky, because a nation might get arrogant and believe they could knock out 80% of its opponents second-strike, thus not needing a full shield. To this end, a shield against second-strikes, even if only partially effective, gravely lowered the effects of nuclear war (for one party) and thus increased the overall risk.
Moreover, a nation confronting a state with such a shield might also be more belligerent, and try to attack first, so that their own nuclear forces would have the best chance at getting through. Such are the intricacies of nuclear deterrence.
One of the problems with the shield today is that it is no longer clear who exactly it is meant to defend against. The five major holders of atomic weapons are the USA, UK, France, Russia, and China. Given that the ideological differences which once caused the Cold War have largely disappeared, and that they are very dependent on each other for trading purposes, the possibility of a nuclear war between them have been considerably reduced.
That leaves rogue states like North Korea and Iran. North Korea has already detonated nuclear weapons, and the possibility certainly exists that other rogue states could provide nuclear weapons to terrorist groups. Their problem then becomes one of delivery. The superpowers got around this by creating intercontinental ballistic missiles, which enable them to launch massive coordinated attacks on any point of the world. (An ICBM blasts a warhead into space on a sub-orbital ballistic trajectory, hence the name "ballistic" missile). So far, North Korean missiles consistently flop into the ocean mid-trajectory.
Perhaps surprisingly, missile technology is a lot more complicated than nuclear weapons technology, in which the major problem is getting hold of the nuclear material. It also needs a lot of testing which, given the nature of the activity, can hardly be carried out in secret. In the event that someone launched an attack, it would be very clear where such missiles were launched from.
But why would a state, or terrorist group, bother with this? If you are only going to launch one or a handful or weapons, why would you go to the bother of developing this technology when you could simply put your bomb on a ship and sail into New York Harbor? It would be cheaper, simpler and more reliable. It would have the added advantage of being anonymous and would possibly allow you to escape the certain overwhelming US retaliation.
“”$100 billion dollars against an attack mode which is literally the most inconvenient, least likely way for bad guys to kill Yanks. Terrorists don't have missiles. Terrorists have VANS. A white-panel-truck defense shield, THAT would be worth our money. Tie the INS database into the Ryder rental computer. Now we're talking science.
The SDI system must never get any false positives (mistakenly shooting down an airliner would be very bad public relations, as both America and Russia
know still haven't learned after three decades), and would have to work perfectly the first time it was needed. That distant sound you hear is every computer geek on Earth laughing bitterly at the idea.
Using principles of electronic warfare it is possible to overwhelm any missile defense with a threat cloud deployed by one or more ICBMs. This is a relatively cheap countermeasure consisting of dummy warheads mixed in with the real warheads, as well as radar-reflecting metal chaff and infrared-emitting aerosols, thusly preventing the missile defense system from being able to reliably eliminate the actual threats. The real bombs can in principle be identified by their greater mass as compared to the decoys, but if the cloud is deployed soon enough before the defense system needs to intercept the bombs, there is not enough time to identify them.
Lyndon LaRouche is a big supporter of SDI, and claims that he came up with the idea and sold Reagan on it back when his associates were trying to infiltrate the Reagan administration. This claim is probably untrue; it is in keeping with LaRouche's tendency to distort public policy initiatives and either try to claim them as his own, or promote weird LaRouchian versions of them. But there was some bit of toying around there as the Reagan administration eventually cut off contact with the LaRouchies after embarassing media stories made this an issue.
 See also
- Did Star Wars Help End the Cold War? - The comprehensive demolishment by Pavel Podvig
- Israel's Iron Dome Does Not Vindicate SDI
- Another possible use for SDI - Orbital laser assassinations!
- ↑ 'Star Wars' Push Dimming Prospect for Exotic Arms, The New York Times
- ↑ Giving the word "spin-off" a bad name.
- ↑ Here's charts of Soviet total military and nuclear stockpile growth if you want a frame of reference. Start from the mid-60s.
- ↑ Status of World Nuclear Forces, Federation of American Scientists
- ↑ "Sub-orbital" refers to velocity, not height — a ballistic trajectory can have an apogee higher than low Earth orbit.
- ↑ There's a reason why the term "rocket science" is used to describe anything that's extremely complicated or difficult for the layman to do.
- ↑ I Miss Republicans, Kung Fu Monkey
- ↑ The forgotten story of Iran Air Flight 655, Washington Post
- ↑ The downing of Flight 007: a Cold War tragedy still seems surreal, CNN
- ↑ Performance Anxiety, Arms Control Wonk
- ↑ The LaRouche Connection, The New Republic, November 19, 1984.
- ↑ On 25th Anniversary of "Star Wars," Cheney's Missile Defense Claims Don't Add Up, Center for Arms-Control and Non-Proliferation