(OOC: revised/minor edit of something from the Unionverse)
Developed late in the war, and deployed during the last six years, the Mk.171 Mobile Field Base/Walker Artillery Platform is among the largest ground combat machines ever devised. A massive walker attached to Division-size units, the "Cockroach" is capable of supporting large-scale assaults and carrying an entire Battalion of men and equipment, including armoured vehicles and drones. Unique weight-distribution and balance-control systems make sure its nearly thousand-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. Ship-grade armour plating gives the walker a great deal of protection, especially against artillery and air-to-ground munitions. The Mk.171 MFB/WAP can literally wade through static enemy defences, and annihilate them with overwhelming force. The walkers can be brought down in specially-built landing barges or be paradropped in, its under-mounted repulsorjets softening the landing velocity enough to cushion it against the ground.
Model: Mk.171 "Cockroach" Mobile Field Base/Walker Artillery Platform
Crew: 20 (commander, driver, communications crew, gunnery crew)
Height: 25 meters (mortars retracted)
Length: 75 meters
Mass: 910 tons
Number produced: in excess of two million (one per division, plus replacements)
Powerplant: Ultracompact Tokamak Reactor, output 400 GW
Armour: Titanium Theta
Armaments: 2 x 28cm Particle Projector Cannons, output 120 gigawatts; 2 x 880mm Linear Cannons; 2 x 68cm Mortars, retractable; 10 x 380mm Casemate Rifles; 60 x 155mm Twin Howitzers; 3 x ten-tube SAM pods; 20 x Forward VLS cells, surface attack missiles; 50 x Rear VLS cells, short-range ballistic missiles; 60 x Computer-Controlled 30mm CIWS, retractable; 100 x Computer-Controlled 12.7mm machine-guns, retractable.
Troop capacity: One Divisional Staff Battalion, consisting of 1 Rifle Company and 1 Staff Company in forward compartment, plus 1 Panzer Company, 1 Medical Company, and 1 Signals Company in rear compartment; total of 500 soldiers, five Mk.50 Main Battle Tanks, ten Mk.35 Infantry Fighting Vehicles, ten Mk.14 Utility Trucks, five Mk.48 Mobile Assault Guns, two Mk.21 Reconnaissance Vehicles, six Mk.9 Field Ambulances, and two Mk.70 Command and Communications Trucks.