Strategic Defense Initiative
The Strategic Defense Initiative (SDI) was a plan created by U.S. President Ronald Reagan on March 23, 1983[1] to use ground and space-based systems to protect the United States from attack by nuclear ballistic missiles. The initiative focused on defense instead on the offensive mutual assured destruction (MAD).

Notes
- Federation of American Scientists. Missile Defense Milestones Archived 2008-12-22 at the Wayback Machine. Accessed March 10, 2006.
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