According to the map Sovereign, the X08 Selva Tigre was developed sometime before 2014 by the Federation defense contractor "Industrias Soberanas" to serve as the country's main battle tank. It was later scrapped in favor of better-armored T-90MS, that replaced the X08 as Federation's Main Battle Tank.
The multiplayer map Sovereign is located in a tank production facility, where numerous Selva Tigre tanks are being constructed. There are several poster schematics scattered all across the map identifying both the tank's designation and the name of the defense contractor responsible for its development. There is also a fully built version next to the A flag spawn.
During the level End of the Line, several X08s can be seen being built in the factory.