The 91st Schrott Experimental Regiment is an Imperial Guard Regiment that is backed by the Adeptus Mechanicus and allowed to field highly experiemental weapons or salvage weapons and vehicales.
The planet Schrott was and still is a massive Vault containing uncountable prototypes and designs for experimental weapons that were discarded or sequestered away for various reasons. Initially it was a peaceful place with scattered forests and other wildlife. Until the 1,000 year war when every faction minus the Necrons and Tyranids attacked Schrott for each thier own reasons. The war saw millions of tons of vehicales and equipment used by all sides until the entire planet was covered in hundreds of meters of scrap metal and fallen war machines. Gigantic war ships crashing to the planet from the combat in the skies only added to the sheer tonnage left upon the planet. Eventually the Imperium won but the planet had been scarred beyond reconigtion. The entire planet had become a huge scrap yard covered in the remains of the war machines that fought there. It earned its name from this blight, Schrott which means mearly "Scrap" in the native language of those who managed to survive the battle. The Mechanicus Vault had been opened in the later stages of the conflict and hundreds of experimental weapons emerged to fight against the enemy, many of which were lost amoung the scrap piles that rose up on the land.
Many years later the citizens with help from the mechanicus rebuilt civilization upon Schrott. Classified now as a Death World due to the harsh climate and environment that has evolved from the planets state. The Water is full of heavy metals, the rain is acidic, massive dust storms can rend flesh from bone in seconds, and powerful gamma storms can vaporize a man with its unending blasts of searing lightning. Life is harsh but the poeple on Schrott are tough and very resourceful.
The style is based on the post
apoc style movies and games. Like RAGE, Twisted Metal, Mad Max and others. Transportation across the planet is again, a combo of those mentioned. one of the traditions upon Schrott is that at age 17 must build their own vehicale, which leads to many unique machines.
The army is very armor heavy with each and every tank or machine having a name of its own and some sort of modification or experimental weapon, Others are Salvaged machines that have been captured, refurbished or built from peices parts. It still includes plenty of troops however
Now. Further digging in the Vault has located a series of Power Frames. Powered suits of armor that are equivilent to the Space Marine Power Armor. a Sub Division has been created to study these and deploy them in combat. Dubbed Section 9 they fight under the command of the 91st using these Power Frames, They are only used by the most highly trained and experienced troops the 91st has to offer. (Space Marine Allies)
Blog for additional fluff and more machines.
http://www.dakkadakka.com/dakkaforum/posts/list/417916.page
Experimental Weapons.
Salvaged Weapons.
Full army.
Section 9