General Fluff: The Cadian 42nd, one of the many Cadian regiments, has been through quite a few fights. Although loyal to Cadia and the Imperium of man, most of the Recruiting and training process is done on their homeplanet, Osmodoro. Osmodoro is a planet about the same size as Cadia, with about 40% water, and the rest covered by either iced glaciers, birch forests, and huge, open fields. The harsh environments contributes to their soldiers toughness and bravery. Wearing metallic blue Flak Armour over Khaki-Brown jackets and pants, they're often called 'The Muddy Murderers' because of them using mud as camouflage.
Osmodoro also holds the HQ of a Space Marine chapter: The Angels of Osmodoro. A highly mechanized chapter, utilizing almost only vehichles, such as Razorbacks, Land Speeders, and such. Their Veterans and Terminators are also feared warriors, stopping at nothing to win.
The Cadian 42nd and the Angels of Osmodoro often cooperate in combat, utilizing eachothers transports, providing covering fire, protecting eachothers backs, etc. As an example, during the Great Cultist Uprising in 768 M40, the both forces rammed the enemy with Razorbacks, perforated them with Las- and Bolterfire, and sacrificing oneself for another.