In South Korea, where there are 28, 500 troops, the U.S. plans to move its forces from the Yongsan Garrison in Seoul to Camp Humphreys, about 40 miles south of the capital.

NPR: Report: US Footing Greater Bill For Overseas Bases

Strengthening the security forces will be expensive, but cheaper than trying to garrison Afghanistan permanently with Western troops.

ECONOMIST: Afghanistan: No time to go wobbly | The