By David Alexander and Phil Stewart | Reuters

WASHINGTON (Reuters) - President Barack Obama unveiled a defense strategy on Thursday that would expand the U.S. military presence in Asia but shrink the overall size of the force as the Pentagon seeks to slash spending by nearly half a trillion dollars after a decade of war.

The strategy, if carried out, would significantly reshape the world's most powerful military following the buildup that was a key part of President George W. Bush's "war on terrorism" in Iraq and Afghanistan.

Cyberwarfare and unmanned drones would continue to grow in priority, as would countering attempts by China and Iran to block U.S. power projection capabilities in areas like the South China Sea and the Strait of Hormuz.

But the size of the U.S. Army and Marines Corps would shrink. So too might the U.S. nuclear arsenal and the U.S. military footprint in Europe.

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