The Middle-Son 1999 is a submarine from the Regular Army to scouts the water areas or offensive ways.
The Middle-Son 1999 is an upgraded version of the old Middle-Son 1986. Only one unit was ever produced and, for an unknown reason, mysteriously disappeared. During the First Modern War, the wreckage of the Middle-Son was found in a dried-up riverbed in the Villeneuve Mt. System, but nobody knows how it ended up there. As it stays there, the Rebel Army uses it as a shelter or interceptor.
- It resembles an Ohio-class submarine.
- It is probably the current main submarine class for the Regular Army.