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"The battle-hardened approach to depicting the current conflicts has shown up in features, on television and in other documentaries: “The Hurt Locker,” a feature film about a bomb-disposal unit in Iraq that won the best picture Oscar this year; “Generation Kill,” a 2008 HBO mini-series by David Simon and Ed Burns; and “Gunner Palace,” a 2005 documentary about an artillery unit in Iraq. But “Restr…