CAMP PENDLETON -- A Marine pleaded guilty Monday to aggravated assault and conspiracy to obstruct justice in the case of an Iraqi civilian who other servicemen said was kidnapped and killed by members of the squad. Lance Cpl. Tyler A. Jackson, 23, entered those pleas and others through his attorney Thomas Watt at a military court hearing. Jackson pleaded not guilty to murder, kidnapping, larceny, housebreaking and another charge of conspiracy. Jackson was the third serviceman to plead guilty to reduced charges in return for his testimony in the case, in which seven Camp Pendleton-based Marines and a Navy corpsman...