USA HISTORY

Detailed explanation-1: -Strategic Defense Initiative (SDI), byname Star Wars, proposed U.S. strategic defensive system against potential nuclear attacks-as originally conceived, from the Soviet Union. The SDI was first proposed by President Ronald Reagan in a nationwide television address on March 23, 1983.

Detailed explanation-2: -On March 23, 1983, the president announced the next stage of his plan: the Strategic Defense Initiative (SDI). In a broadcast to the nation, Reagan explained that the SDI, which later became known as his Star Wars program, would see the development of anti-ballistic missiles that could shoot down weapons in space.

Detailed explanation-3: -The Strategic Defense Initiative (SDI), derisively nicknamed the “Star Wars program", was a proposed missile defense system intended to protect the United States from attack by ballistic strategic nuclear weapons (intercontinental ballistic missiles and submarine-launched ballistic missiles).

Detailed explanation-4: -National Missile Defense (NMD) is a program designed to defeat a limited ballistic missile strike against the United States. This system uses a Ground Based Interceptor (GBI) to hit the incoming warhead before it reenters the atmosphere.

Detailed explanation-5: -Project Excalibur was a Lawrence Livermore National Laboratory (LLNL) Cold War–era research program to develop an X-ray laser system as a ballistic missile defense (BMD) for the United States. The concept involved packing large numbers of expendable X-ray lasers around a nuclear device, which would orbit in space.