Recent encounters with Covenant remnants and Prometheans have made it clear to UNSC high command that the Mantis and Cyclops proved very effective and mobile armor and shock units. This Mantis was outfitted with heavier armor and a small caliber Rail gun capable of destroying targets with as much mass as the T 26 AGC Wraith and disabling targets with as much mass as the T 28 TC Spirit. The cycle between shots is very slow. Therefore it was also fitted with four 15mm compound gun and a 20mm cannon on its 'nose' to compensate. Additional sensors and tactical awareness modules were also installed on this Mantis.