There is a scene in American Sniper where an Iraqi bends down to pick something off the floor and in doing so his elbow was exposed. It was a bright red colour as if it had been burned.
From this, the hero determined that the Iraqi was an enemy insurgent. It recalls a scene from Inglorious Bastards where a careless gesture compromised a unit that was meant to be incognito. Somehow I missed the connection in American Sniper.
How did a burned elbow betray the insurgent's cover?