Editing Armageddon Steel Legion

Take the Death Korps of Krieg, replace the doom and gloom with slightly less doom and gloom, throw them into the largest land war in modern Imperial history, and give each man his own Chimera. What you get is the Armageddon Steel Legion, one of the most heavily mechanized Imperial Guard units in the galaxy, with a penchant for fighting Orks.

==The First War for Armageddon==
So, minor bit of history. Armageddon is pretty much a big ass factory, that on three occasions has been trashed. The first time, Angron decided it would make for a nice summer home, and decided to party for a while with a couple thousand Khorne Berserkers. Much partying was to be had before someone called the cops with a noise complaint, and the Grey Knights, Space Marines and whoever hadn't been killed managed to take back the planet, with a hundred Grey Knights dying to banish Angron.

When the party was over, the Inquisition decided to take out the trash, meaning that they forced the entire population of Armageddon into labor camps and worked them to death on suspicion of heresy, before repopulating the planet. This pissed off Logan Grimnar and the Space Wolves to no end, because they had the audacity to think that actually helping people was the right course of action.

==Armageddon 2: Electric Boogaloo==
Jump ahead a few centuries, and we get the real origins of the Steel Legion. Warboss Ghazghull Mag Uruk Thraka decided that Armageddon would be a nice place for a WAAAAGH and so there was a big ass fight. Commissar Yarrick led the defense of Hades Hive, holding out for months without support against a gigantic Ork offensive, before finally retreating when Ghazghkull dropped a Rok on it, trashing the place.

With the Guardsmen stretched thin, the Blood Angels arrived to pull their asses out of the fire, doing what Indrick Boreale couldn't and performing a successful Steel Rain attack. The entire company dropped into the Ork Horde and fought nonstop until the Orks fled. Ghazghkull said he'd be back, so the Guardsmen began prepping for war.

==The Third War for Armageddon
Preparing for his return, the Steel Legion became insanely fortified, with the Munitorium granting them a lessened tithe to keep local forces numerous enough to defend the planet. Millions of tanks, transports, and any other vehicle they could build were used in a gigantic buildup for the Orks return.

When they finally did, the Third War quickly escalated into the largest Ork WAAAAGH in history, drawing in dozens of Space Marine chapters, Imperial Guard regiments and even Titan Legions. After a mostly successful initial defense, the Steel Legion was slowly pushed back into heavy street fighting, turning the war from the Africa Campaign into Stalingrad, with tanks rolling off the factory floor into combat zones. The war is still ongoing, even if it was technically an Imperial victory. Steel Legion units now use the permanent Ork infestation for training purposes, keeping them away from the major hives.

==Steel Legion Troops==
What can you say? They're German Mechanized Infantry IN SPAAAAACE! They wear bitchin' trench coats and gas masks, they fight Orks on a regular basis, and they have access to a metric fuckton of armored vehicles. They probably use Chimeras as condos.