The Columbia I was the first post-Apocalypse AFV produced within what was to become the UKA. A crude copy of the old U.S. M113 armored personal carrier, the Columbia I was produced by the Portland Republic in that city by the DeHaven family boiler works, later the Royal Arsenal. Coal burning, steam propelled, it had a crew of seven. It was armed with a black powder 152mm breech loading howitzer as well as a rack of pistols. Full speed on level ground was 6 mph. Nine of the Republic of Portland's 12 Columbia's were destroyed in action by the Maui Regiment (later the 1st Maui Fusiliers) at the battle of Silver Springs in 2007. The remainder were issued to the fledgeling 1st Battalion/ Royal Tank Regiment and production was continued. A total of 25 Mk. I's were built. The entire stock of Mk. I's were converted to the alcohol burning Mk. II, save for the vehicle illustrated, which currently resides in the Imperial War Museum in Portland. The Mk. II was identical in appearance and and performance. It had only a crew of five, however, as the two stokers were rendered unnecessary. Ninety-eight MK. II's were built between 2008 and 2014, with a further fifteen converted from Mk I's.
The Willamette II is the current production medium tank for the UKA Royal Army. Built in Portland by the Royal Arsenal, it is roughly based on the World War Two German Panzer IVH. Armed with a 75mmL48 main gun, and three 8.56mm Purcell medium machine guns, it is a formidable opponent. It has a crew of five, weighs twenty five tonnes, and is capable of a top speed of forty kph on level ground. It is an improved version of the Willamette Mk. I, the first turreted tank made by the UKA. The first Mk. II's went into service in 2040. This tank equips 1 RTR, 2 RTR, 3 RTR, 4 RTR, the Guard Marine Tank Company, and two battalions of the Imperial French Army. There are no plans in the works to replace this reliable and effective vehicle, and it is expected to eventually replace all other types of tanks currently in service outside the heavy tank companies and the Guard.
The Matanuska is the medium tank issued to the 2nd and 4th Guard Tank Battalions and is also used by the South African Army. Currently, the 1st Guard Tank Battalion is in the process of re-equipping with this vehicle. The Matanuska is armed with a 75mm L70 gun and three 7mm HHC machine guns. It weighs 45 tonnes, has a crew of five, and has a top speed of fifty kph. The first Matanuskas went into service in 2044 with the 2nd Guard Tank Battalion, which distinguished itself in the fighting at Lawrenceburg that summer. The Matanuska will eventually become the standard tank of the Guard armored troops.