MPS-79

The MPS-79 is a type of Powered Suit developed in Academy City that are still utilized by the jailors in the Reformatory.

Principles
Not much about this suit is known except that it is an older Powered Suit design than the HsPS-15. They are utilized by the jailors of the Reformatory and can be equipped with anti-esper weapons.

Battle Royale Arc
Despite being referenced by Tsuchimikado Motoharu as being used by the jailers of the Reformatory, they do not encounter a single MPS-79 when they arrive there, which implies that BLOCK may already dealt with them. In manga adaptation, the remnant of BLOCK mercenaries battle against MPS-79.