CAMP PENDLETON, Calif. — Charges have been dropped against a captain who was accused of failing to investigate the deaths of 24 Iraqi civilians in the town of Haditha, the Marine Corps said Tuesday. Capt. Lucas M. McConnell of Napa was granted immunity and ordered to cooperate with officials looking into the November 2005 killings, the Marines said in a press release. Charges have now been dismissed against four of the eight Marines who were initially charged with murder or failure to investigate the deaths. A battalion commander has been recommended for a court-martial; a final decision is pending. The...