The Reagan Doctrine envisioned countering aggression by the Soviet Union or its proxies anywhere in the world.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2

Later, as Director of Central Intelligence, he was a principal supporter and promulgator of the Reagan Doctrine, which resulted in the liberation of millions of people throughout the world.

CENTERFORSECURITYPOLICY: Center for Security Policy | 1997 Freedom Flame/Casey Medal of Honor Award: Edwin Meese III

But for my money it is the Reagan doctrine, spelt out very clearly in the speech he gave to British parliamentarians in the Palace of Westminster in 1982, that has had the best and greatest impact.

CENTERFORSECURITYPOLICY: 'Courage'