From Halopedia, the Halo wiki
United Nations Space Command
UNSC Marine Corps
Unknown number of Marines
Boulder Squad is a squad of UNSC Marines who fought in the Installation 07 conflict.
On January 31, 2560, Boulder Squad accompanied Spartan Bonita Stone to Sector 63 overlooking Riven Gate, where they observed a massive Banished force gathering in preparation for an all-out assault on the Reverie.