Gen. Mattis evidently consulted experts on the proper way to wave to Iraqis according to this LA Times article.
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At this smuggling and farming village on the Syrian border, Mattis told Marines to be prepared to make eye contact and wave even if just moments earlier a Marine has been injured or killed by the roadside bombs and snipers that remain a daily threat.
Whenever you show anger or disgust toward civilians, it's a victory for Al Qaeda and other insurgents, Mattis told Marines in a makeshift chow hall at Camp Gannon, named for a Marine officer killed in a 2004 firefight.
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