Alleged confessions appear to form the crux of the government's case against seven Marines and a Navy corpsman charged with murder, kidnapping and other crimes in an Iraqi man's slaying last April. Defense attorneys challenge the validity of the statements and say without them the government's case is baseless. Details about the prosecution's case emerged Wednesday during preliminary hearings for two of eight men accused in the shooting death of 52-year-old Hashim Ibrahim Awad in the village of Hamdania. At Marine Cpl. Marshall L. Magincalda's hearing, prosecutors submitted a thick packet of evidence and pointed to three documents they say...