In 2555, he was contracted by the UNSC Navy's Office of Naval Intelligence to be a member of their Xeno-Materials Exploitation Group task force on Installation 07. He worked closely with Doctor Luther Mann. During a mission to Installation 00 to stop the activation of the Halo Array, Lamb was killed by a damaged Sentinel controlled by 000 Tragic Solitude shortly after they succeeded in shutting the Array down. After the Elites found a way back to the surface, Usze 'Taham went back and retrieved Henry's body to bring it back to the Mayhem. The Henry Lamb Research Outpost on the Ark was later named after him.
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