A Marine on Tuesday admitted killing an unarmed prisoner during a 2004 battle for the Iraqi city of Fallujah, but he is not expected to receive any jail time and could leave the service with an honorable discharge, his attorney said. Sgt. Jermaine Nelson's admission came as part of an agreement that saw him plead guilty to two counts of dereliction of duty for violating the military's rules of engagement and ignoring the laws of armed conflict with regard to treatment of enemy prisoners. Two other men accused of murder for the deaths of three other detainees in the same...