The global challenges facing the United States have shifted constantly since 1960, from the Cuban Missile Crisis to the fall of the Berlin Wall, and from the first Gulf War to current campaigns in Iraq and Afghanistan.rnMuch has changed, for example, since Secretary of Defense (1961-1968) Robert McNamara proclaimed a requirement to fight two major conventional wars and one minor war simultaneously (the 2 1/2 War Strategy), while maintaining a large nuclear force.
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