An image of an ID badge circulating widely online that shows the suspect in the shooting of the National Guard members says he was assigned to the "Kandahar Strike Force" or "03" unit, one of a number of so-called "Zero Units" that worked closely with U.S. and other foreign forces during the war in Afghanistan . A former senior Afghan military source confirmed to CBS News that the ID badge is authentic.

A U.S. official briefed on the shooting investigation and a former senior Afghan National Defense and Security Forces member told CBS News that the suspect, Rahmanullah Lakanwal, had been part of a "Zero Unit," an Afghan intelligence unit and paramilitary force that worked with the CIA. The units were exclusively composed of Afghan nationals and operated under the umbrella of

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