From Halopedia, the Halo wiki
The Protector Cyclops, also known as the Damage Control Cyclops, is a specialised variant of the HRUNTING Mark III Cyclops, employed by the UNSC Marine Corps and civil emergency response units including firefighting and medical response.
Deployed in high-threat civil rescue missions, Protector units (usually older B-II units) are used by firefighters and medical response teams for deployment in situations where larger vehicles cannot fit, and unprotected workers would risk death. A typical configuration mounts a large tank of fire-retardant foam and a high-pressure projector, and a high-torque gripping arm for ripping apart mangled vehicles to get at trapped occupants or breaking the reinforced walls seen in many arcologies. The variant is also carried aboard UNSC starships for the purposes of firefighting, repairing hull breaches and emergency response. It comes outfitted with a large manipulation claw and a fire-suppression tank, as well as several smaller tools for the operator including a shovel, pickaxe and axe.
The Protector Cyclops was first visualized by MEGA Brands Halo Toys as the "Damage Control Cyclops". The vehicle was considered a separate entity to the Mark III described on Halo Waypoint until February 2020, when Jeff Easterling confirmed the connection.