The planet Krieg. (DeathKorps Basic training.)

The Death Korps of Krieg is the name given to all of the Astra Militarum regiments that originate from the devastated, post-atomic Death World of Krieg in the Segmentum Tempestus. They are most commonly deployed in the war zones of the Segmentum Tempestus and Segmentum Solar and are particularly skilled at attritional trench warfare, sieges of and assaults upon heavily fortified static positions and warfare in extreme environments known for their biological, chemical and radioactive hazards. Krieg was the site of a rebellion against the Imperium of Man over 1,500 standard years ago in the 40th Millennium and was bombarded with nuclear weapons followed by five hundred Terran years of grinding warfare between Loyalists and Traitors to purge the heretical rebels. https://warhammer40k.fandom.com/wiki/Death_Korps_of_Krieg