Abu Muqawama: Green-on-Blue Violence Calls Afghanistan Strategy Into Question

Green-on-blue violence -- attacks on U.S. and allied forces by their Afghan partners -- is the most serious tactical challenge to the NATO coalition since the war in Afghanistan began almost 11 years ago.

The name "green-on-blue" derives from U.S. military war games in which "blue" forces are friendly, "red" forces are enemy and "green" forces represent those of the host nation. ("Blue-on-blue" has thus long been the U.S. military shorthand for friendly fire incidents.)

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