Another student has been told by school officials to take off his Marine Corps T-shirt or face suspension after a teacher found the crossed rifles shown on the front to be inappropriate. Daniel McIntyre of Genoa, Ill., said he could tell something was bothering his 14-year-old son, Michael, when he got off the school bus on Monday. “He said, ‘Dad, I’m really upset about what happened at school today,’ ” McIntyre said. ” ‘My teacher threatened to suspend me because she thought my T-shirt was inappropriate and I needed to cover it up or turn it inside-out.’ ” That shocked his dad…