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A U.S. Marine finds a way through the tall grass on the bank of the Euphrates River in Ramadi, Anbar province, Iraq, Feb. 2, 2007. Members of the Marine Dam Security Unit 3 found heavy artillery shells and mortars, commonly used to build improvised explosive devices (IEDs), the number one killer of American forces in Iraq. Insurgents fired on the Americans as they were about to detonate the cashe, sparking a brief gunfight, but no one was injured in the exchange.