A labor designed Muscle Tracer, the CR-MT77 is completely unarmed and thus a non threat to an AC. This model appears mainly in bases and is a target you must protect. It's military variants, the CR-M77M and RO are fought frequently throughout the game.
None really, it's unarmed and a non threat.
The CR-MT77 appears twice in missions, both involving the AMIDA bio weapon coincidently.