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The {{Main|Imperial Tithe}}As a broad generalization, guardsmen are typically supplied to the [[Departmento Munitorum]] as a 1/10th of a world or system's [[Planetary Defense Force]] (PDF). Governors are expected, on pain of death, to raise and maintain a large enough PDF at any given time such that they are able to meet both a set quota of recruits while also maintaining enough forces to defend their realm. It is also a capital offense if these recruits are not supplied with appropriate uniforms, equipment, training, or if they possess [[mutant| insufficient genetic purity]]. Thus typically, guard recruits are often supplied as the best among a PDF.{{fn|24}} More specific recruitment (or conscription) and training of each Guardsman is based entirely on the customs and traditions of their native homeworld, a result of the [[tithe]] imposed on each [[Planetary Governor]]. Just as there are a million worlds in the Imperium so too are there a million ways one can become a Guardsman; for many it is considered an honour to join the Guard, or at least a way to escape a wretched existence. The result are Guardsmen as wildly different from each other as possibly, from highly-trained professional soldiers to savage gang-fighters and medieval barbarians. If any additional training is required, especially among primitive recruits with little to no knowledge of how to work modern weapons of war, it will be given in transit to their initial deployment.{{Fn|1a}}{{Fn|3a}}{{Fn|5a}}{{Fn|6}} {{Main|Whiteshields}}One common method of recruitment and training is through the raising of ''probitors'', more commonly known by the informal term as [[Whiteshields]]. These are the sons and daughters of Imperial Guardsmen and Guardswomen, born on militarized worlds and raised by the regiment as cadets until they are old enough to earn the rank of guardsman proper by fighting in a battle alongside regular guardsmen. [[Cadians]] in particular make especial use of this method via their Youth Armies. {{Main|Conscript}}In times of desperation, the Imperium may undergo a period of conscription to field more troops. This can include fielding even more probitors, as is the case in Cadian Regiments, but also other candidates with little to no training and hastily deployed. Entire cities, even continents might be trained of citizens this way.{{fn|24}}