Blackwater Worldwide, the security contractor blamed by an angry Iraqi government for the shooting deaths of 17 civilians, is not expected to face criminal charges — all but ensuring the company will keep its multimillion-dollar contract to protect U.S. diplomats. Instead, the seven-month-old Justice Department investigation is focused on as few as three or four Blackwater guards who could be indicted in the Sept. 16 shootings, according to interviews with a half-dozen people close to the investigation. [also refers to Chiquita]