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Colin Powell, former U.S. secretary of state, speaks during a Bloomberg Television interview in Washington, D.C., U.S., on Friday, May 24, 2013. Powell, who served in three Republican administrations, said U.S. President Barack's Obama's National Defense University speech "made it clear that there are still enemies out there" but the U.S. has to be "more careful" with the use of force, "especially with respect to drones." Photographer: Andrew Harrer

Rules to Live By

Rules to Live By As I was pondering what to write for the blog this month, I happened to glance at a plaque that has been next to my desk…

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