Evolutions is a "Halo Wars" style mod for Command and Conquer 3: Tiberium Wars that features epic ground and air warfare on a massive scale. Evolutions brings many instruments of war from the Halo universe to life, allowing the player to fight as the Covenant or the UNSC in epic battles based on iconic Halo locales.
The colloquially named "four-forty" is an mobile Onager MAC used by the UNSC Armed Forces. It had been introduced recently as of October 2552, during the invasion of the Covenant the UNSC responded by deploying several Four Forty's near locations where the Covenant have landed some of their CCS Cruisers.
i bet this thing is huge
largest mobile unsc land bases artillery