From Halopedia, the Halo wiki
Around the time Master Chief John-117 arrived on the fragmented section of Zeta Halo, Banished forces attacked Cayman Squad. After the Chief recaptured FOB Golf, his AI companion, the Weapon, picked up Cayman's distress call, prompting the Spartan to rescue the marines.
In Halo Infinite, Cayman Squad is found in the "Lockdown" section of the campaign. Answering their distress call earns the player 30 Valor points. This valor is awarded even if all members of Cayman Squad are killed.
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