The Kasrkin are elite troops of the Imperial Guard and are dedicated to the security of the Fortress World of Cadia from which they hail. Because they are elite special forces troops drawn from the same world as the existing Cadian Shock Troops Regiments of the Imperial Guard, the Kasrkin are officially classified by the Departmento Munitorum as the type of Storm Troopers known as Grenadiers because of their heavy weapons and elite tactical training. Their name comes from the title of the fortress cities of Cadia, which are called "Kasrs" in the native Cadian dialect of Low Gothic. The Kasrkin are the elite of the already skilled Cadian planetary military forces and are chosen to serve in the Imperial Guard when they are still serving as Whiteshields (new recruits) in the Cadian Planetary Defence Forces. Their training is more than a match for that provided to the elite Imperial Storm Troopers (Kasrkin are the Cadian equivalent of the Storm Troopers) and they are utterly dedicated to the preservation of Cadia, whereas Imperial Storm Troopers are indoctrinated to provide for the defence of the entire Imperium of Man. Kasrkin soldiers are well-known amongst the Storm Trooper regiments assigned to Cadia, and are renowned for their ability to remain cool under fire in combat situations where even many other veteran Cadian Guardsmen would break.