Mk.171 Mobile Field Base

Developed and deployed during the last decade of the war, the Mk.171 Mobile Field Base is among the largest ground combat machines ever devised. A massive hovercraft attached to Divisional headquarters, the "Cockroach" is capable of supporting large-scale assaults and carrying an entire Company of men and equipment, including armoured vehicles and drones, as well as housing a field hospital. A powerful repulsorlift drive and a ground-effect air cushion system make sure its over 18,000-ton mass doesn't cause it to sink into the ground.
Armed to the teeth with artillery, VLS, linear cannons, and particle projectors, the walker is able to lay down a field of fire comparable to no other land vehicle. Highly ductile and thermally-conductive armour plating gives the "Cockroach" a great deal of protection, especially against artillery and air-to-ground munitions. The Mk.171 MFB can literally wade through static enemy defences, and annihilate them with overwhelming force. The "Cockroach" can be carried down in specially-built landing barges or be paradropped in, its under-mounted repulsorlift drive softening the landing velocity enough to cushion it against the ground.

Model: Mk.171 "Cockroach" Mobile Field Base
Crew: 15 (commander, driver, communications crew, gunnery crew)
Height: 40 meters
Length: 170 meters
Mass: 9000 tons dry; 18,000 tons full
Powerplant: 2 x G1FB Nuclear Reactors; 2 x turbine generators each
Power output: net 200 MWe; 50 MWe per generator
Armour: boron carbide composite
Shields: 6.3 terajoule burst capacity
Armaments: 2 x Particle Projector Cannons, impact yield 4.25 terajoules; 2 x Single-Gun 280mm Rifle Turrets; 12 x 127mm Casemate Rifles; 2 x 155mm Retractable Linear Accelerator Mortars; 10 x Free Electron Lasers, 15 megawatt output; 10 x Twin-Gun 127mm Rifle Turrets; 4 x retractable MGM-801 "Hoe" Missile racks; 2 x 64-cell VLS module; 48 x MGM-256 "Ares" Short Range Ballistic Missile vertical launch tubes.
Troop capacity: One Army Company (100 soldiers) plus vehicles.