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Pfc. Erik (cq) McDonald (right) of Iowa City, with the Iowa National Guard HHC Company, 1-133rd Infantry follows Sgt. First Class Steve Beireis of North Liberty, through a doorway as they clear a multiple-room building during an urban operations exercise in a live fire shoot house at Camp Shelby on Tuesday, Aug. 24, 2010, near Hattiesburg, Miss. Soldiers initially walk through the room clearing and search exercise using unloaded weapons then progress to blank rounds then finally live rounds. (Jim Slosiarek)