An woman rides an upward escalator at Pentagon City Metro station during rush hour in Washington October 2, 2013. 
Kevin Lamarque / Reuters

Keeping up: training near Fort Eustis, Virginia, July 2008 (Robyn Gerstenslager / U.S. Navy)

Over the next decade, the U.S. military will need to undertake the most dramatic shift in its strategy since the introduction of nuclear weapons more than 60 years ago. Just as defense budgets are declining, the price of projecting and sustaining military power is increasing and the range of interests requiring protection is expanding. This means that tough strategic choices will finally have to be made, not just talked about. As the British physicist Ernest Rutherford once declared to his colleagues, "We haven't got the money, so we've got to think."

A new strategic framework will be needed, one focused less on repelling traditional cross-border invasions, effecting regime change, and conducting large-scale stability operations and more on preserving access to key regions and the global commons, which are essential to U.S. security and prosperity. The bad

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