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Cadian regiments are organized around a core of companies, anywhere from two to thirty depending on a variety of factors when it was raised (...)
Infantry companies, normally between one to four hundred men each, are led by a command squad and consists of between two to six platoons, as well as any additional support units attached to the company, such as a squadron of Sentinels and a Sentry Gun battery. Each platoon will be led by its own command squad and consist of between two to six squads. Normal infantry squads are given a unique three-digit identifier, while command squads use a two-digit number with a central skull motif; special veteran or Kasrkin squads use a three-digit number beginning with one or two zeros.
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The size and composition of Imperial Guard regiments is not standardised across the Imperium; the number of individual Guardsmen alone can vary enormously between regiments, with some only a few hundred strong at founding-strength, whilst others possess tens of thousands of fighting troops.[1] This non-standardisation is reflected in the organisation of Imperial Guard companies, which can vary in numbers and composition just as much as regiments.
A company tends to have a command staff of its own, with the Company Commanding Officer notionally being ranked as Captain, or some equivalent. This is not universal, however. Depending on regimental organisation, it has been known for companies to be - intentionally - commanded by ranks anywhere from Colonel to Sergeant. Companies tend to be made up of smaller units again, notionally, called platoons (which in turn are made up of squads). Some companies have been observed which do not appear to use the 'traditional' platoon/squad organisation and instead appear to exist as a single entity with squads and details being formed, broken up and re-formed when necessary.[2]
Additionally, companies reflect their parent regiment; it is likely - though not always the case - that the battlefield role of a company matches that of the regiment as a whole. Thus, a company belonging to a Light Infantry regiment is likely to be equipped and outfitted as Light Infantry. However, companies can be detached from their regiment and attached to another (either as a temporary measure or permanently) or seconded to other branches of the Imperium, such as the Inquisition, creating a more varied fighting unit.[3]
Types of Imperial Guard Company
Infantry Company
A Light Infantry Company of the 17th Tallarn Desert Raiders
Infantry companies consist of between two and six platoons (which themselves are made up of between two to six squads) plus command staff and attached support units. The fighting strength of each company is therefore highly variable, especially between regiments, and totally accurate figures are difficult to pin down at any one time. When 12 companies of the Cadian 8th Shock Troops paraded led by Lord Castellan Ursarkar E. Creed, just under 4,000 soldiers were present. This gives a rough company strength of over 300 Guardsmen each.[3] The organisation of infantry companies is mirrored to an extent in that of Light, Heavy, Drop and Mechanised companies.