From Halopedia, the Halo wiki
In February 2558, the UNSC Infinity returned to the shield world Requiem and engaged the Covenant. At some point, Boa Squad was sent at the location codenamed "Control". Roland then discovered that Dr. Halsey was relaying communications to that location after her abduction. When Fireteam Crimson arrived at Control, Boa Squad was already under heavy fire from Covenant forces, including several Mgalekgolo. Only two Marines were still alive and assisted Crimson. Though the Spartan-IVs managed to repel continuous enemy reinforcements and completed the mission, the Marines were killed in the process..
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