The Gryps Conflict Main Story
Lieutenant Jerid Mesa has his Gundam Mk-II seized by the AEUG at Green Noah and sorties in a Hizack that has been brought in.
The Hizack is said to be a mobile suit that forcibly combines the design of the Zaku with that of the GM, and its development base is said to be the Act Zaku or Zaku II F2 type.
The Hizack was manufactured by Anaheim Electronics, and its use was based on the demonstration of the psychological effect that the appearance of a mobile suit has on friend and foe, and the Earth Federation Forces' use of the Zaku had a significant impact on the morale of the Zeon remnants.
Lieutenant Jerid Mesa x Hizack

If we're the AEUG, then the Titans are the ones we have to fight! | おうせい/ゆうせい's Gunpla works