The Mac II Monster was developed as an artillery support unit. Military
analysts believed that any alien invasion would involve the construction of forward bases on
Earth or other planetary bodies, and that these units will be critical in breaching their
heavy defenses. As with many other theories, these beliefs were soon proven wrong in 2009 and
the Monster became an anti-mecha and anti-ship unit to supplement the SDF-1s own firepower.
Its four massive cannons could cause considerable damage to enemy ships, which was further
supplemented with heavy missile launchers in the mecha's arms. The Monster was a relatively
rare unit, with only a few garrisoned on the SDF-1 or on Luna, and the remainder of the Destroids
being decimated on Earth without firing a shot during the holocaust. The Monster remained in
service in post-war Earth, with some falling into the hands of malcontent Zentraedi. The design
was finally decomissioned in 2020 as new REF destroids were introduced.