From Halopedia, the Halo wiki
Maria is a UNSC officer serving as the receptionist at the Quartermaster's help desk on Earth. She responded to a call by Colonel Herzog, where he complained about how a squad of Marines forcibly evacuated him and his belongings from his home on Troy and failed to return some of his papers. After Herzog asked about the marine who had given him a receipt, Maria informed him that the marine had been killed two months earlier. Before ending the conversation, Maria told that she would relay Herzog's request to her superiors and that he would be informed of any new developments pertaining to the case.
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