The nation's military strategy has been permanently altered to focus on the long war ahead to defeat non-state actors and new forms of warfare with state adversaries, the Pentagon's top officer said.

"We are more likely to face prolonged campaigns than conflicts that are resolved quickly … that control of escalation is becoming more difficult and more important … and that as a hedge against unpredictability with reduced resources, we may have to adjust our global posture," Joint Chiefs of Staff Chairman Gen. Martin Dempsey said Wednesday, releasing the 2015 National Military Strategy.

The strategy is one of a handful of core documents that are released by the president, the defense secretary and chairman that guide the nation's defense strategic priorities, and guide how the military will posture itself to execute that strategy.

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