On March 23, 1983, US President Ronald Reagan delivered a speech on national security to introduce the Strategic Defense Initiative (SDI), a concept which also became known among critics and doubters as "Star Wars", believing it was impractical and expensive, perhaps even bordering the realm of fiction. Aimed to derail the principle of mutually assured destruction (MAD), a military doctrine which involved nuclear weapons, SDI is designed to use laser and kinetic weapon systems to deter enemy mis