Obama's Afghanistan trip planned with 'maximum discretion'

BAGRAM AIR BASE (Reuters) - It takes a combination of careful planning and cloak-and-dagger secrecy to transport the president of the United States halfway around the world into a danger zone while making sure almost nobody knows about it in advance.

Barack Obama’s visit on Sunday with U.S. troops at Bagram Air Base - unannounced ahead of time - has been in the works for several weeks as White House officials looked for an opportunity for him to make his fourth and most likely last trip here as president.