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For broader perspective on events surrounding Manning's decision to give the video to WikiLeaks, there is no better source than the account given by video-maker Sonia Kennebeck, nee Mayr.
Her work "Shooters Walk Free, Whistleblower Jailed" appeared first on the German TV program Panorama; it is only 12 minutes long, but -- speaks volumes.
There was nothing like it at the time, so Panorama was persuaded to prepare a version, with Sonia's own voice-over, for English speakers. Strongly recommended. (Kennebeck later directed/produced the award winning documentary film about drone warfare, "National Bird" (2016).
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