MS-06RD-4 Zaku High Mobility Test Type

The Zaku II Prototype is one of many variants of the standard MS-06 Zaku II created by the Principality of Zeon during the One Year War.

History
In preparations to adapt their ground-breaking MS-09 Dom mobile suit for use in space combat, the Zimmad Company decided to field test their new rocket thruster arrays designed for the MS-09R Rick Dom, which was currently in development. Zimmad took a standard MS-06F Zaku II, modified the waist armor area, and attached a larger pair of legs equipped with several new thrusters, renaming the unit the MS-06RD-4 Zaku II Prototype.

The Zaku II Prototype was constructed at Zeon's Granada facility on the moon. It was assigned to test-pilot Aina Sahalin, and was taken for its first flight on October 6th, Universal Century 0079. However, the Zaku II Prototype and its escort units came under attack from an Earth Federation Forces squadron. One of the Zaku II Prototype's escort units was destroyed, and all of the Federation units were destroyed with the exception of one RGM-79[E] GM Precession Type, piloted by Terry Sanders Jr..

The Zaku II Prototype attempted to pursue the GM Type-E and was able to slightly damage it, but Aina was separated from her remaining Zaku II escort. Out of ammunition, the GM Type-E sent out a distress signal, which was picked up by a passing Federation shuttle. The shuttle sent out a RB-79K Ball K Type, piloted by Shiro Amada, to attempt to help the GM Type-E. Astonishingly, Shiro was able to severely damage the Zaku II Prototype, but his Ball K Type was critically damaged in the process and both he and Aina were forced to bail out of their respective units before they both exploded.

Although the Zaku II Prototype was destroyed, Aina Sahalin was able to escape with the test-flight data of the unit before it exploded. This was a great boon to the Zimmad Company, who immediately put the information to good use fine-tuning their Rick Doms.