From Halopedia, the Halo wiki
During the mission to the Soell system and the debris field of Installation 04, the UNSC Marine force led by Sergeant Zhao Heng Lopez became separated while searching the prison ship Mona Lisa. The squad led by Hospital Corpsman Ngoc Benti was having trouble reaching the ship's engineering section. Unsure of her leadership capabilities, Benti wished that her sergeant was with them, but since they had split up to explore the large vessel she might as well have been on a beach in Cozumel.
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