HRUNTING Mark III (B1) Cyclops
From Halopedia, the Halo wiki
The HRUNTING Mark III [B1] Cyclops, also referred to as the Heavy Assault Cyclops, is a specialised variant of the HRUNTING Mark III (B) Cyclops, employed by the UNSC Marine Corps and paramilitary security forces operating in the cities of Earth.
The equipment which can be put onto the hardpoints feature an unidentified weapon and a rocket or missile launchers on the arms of the Cyclops.
The Mark III (B1) was first visualized by MEGA Brands Halo Toys as the "Heavy Assault 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.