The @Astra Militarum , also known as the Imperial Guard,[10] is the primary fighting force of the Imperium of Man, so numerous in size that even the Departamento Munitorum cannot place a figure on the number of Guardsmen under arms at any one time; the lists of new recruits and toll of casualties can run into the millions in a single day.[1] Every single year, trillions of new recruits are tithed into the Guard, giving their commanders a functional infinite source of manpower,[30] with it being said that, if the entirety of the Imperial Guard would form up in a column, it would reach from Terra to Armageddon.
It would be unfeasible trying to put any exact number on the strength of the Guard; however, it is believed that there must be many billions of Guardsmen, divided into millions of regiments. This absolute numeracy provides the Guard with its main power; their ability to deploy in numbers that, eventually, result in victory. Attacking in seemingly endless influxes across battle-zones, charging forth under the cover of massive barrages and delivering massed lasgun volleys, in the Guard the individual Human soldier may appear a lost thing, almost forgotten. Yet the actions of these anonymous soldiers daily decide the fate of worlds. In times of crisis the Imperial Guard will call upon their deadliest of soldiers, whether they are the Imperium's famed Storm Troopers or the regimental elite Kasrkin and Death Korps Grenadiers
The Guard forms the very backbone of the Imperium; without it, Mankind would surely perish. The Guard possesses the courage and the manpower to face and annihilate the enemies of the Emperor across the galaxy.