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==OrganizationOrganisation==

'''Planetary Defence Forces''' (or PDF for short) is a term referring to the primary military defence forces of an [[Imperium|Imperial]] world. PDF are under the control of the local government rather than direct Imperial control; the raising, training, arming, leadership, etc, is entirely in the hands of the [[Imperial Governor]]. All Imperial planets in general are required to maintain a standing army in order to maintain government (and thus Imperial) control over the planet against any possible invasion or insurrection.

In response to any threat, it is the responsibility of the PDF to engage the enemy until Imperial reinforcements can be mustered from the nearby sector. Thus although rarely respected due to their inherent lack of experience, PDF are widely considered crucial to the [[Departmento Munitorum]] as the first line of defense defence for Imperial worlds against [[Xenos]] invasion and [[Chaos]]-inspired rebellion

Many PDF forces base their appearance and equipment off of the venerated [[CadianCadia]] n regiments. Others base themselves off the appearance of other notable regiments, such as the [[Tallarn]], [[Mordian]]s and [[Valhalla|Valhallans]]ns, often motivated by similar climates or even due to assistance from those regiments during the founding of the PDF. Still, given the unique and underlying culture of many worlds, PDFs and by extension their [[Imperial Guard]] regiments are armed and appear as their world can best equip them, a sign of the diverse cultures that constitute the Imperium as a whole.

Although the PDF defaults all command to any Imperial forces that arrive, there are many possible reasons the PDF or elements of it may join in rebellion against Imperial authority; [[Chaos]] or [[alien]] (particularly [[genestealerGenestealer]]) infiltration of the planet, the ambitions of corrupt [[Planetary Governor]]s and other organizations organisations in charge of the planet, can mean the PDF turns against the off-world Imperial forces. This is a cause of mistrust for PDF in general, and further reason for commanders to prefer to rely on non-local defensesdefences.

*²:[[Nightbringer(Novel)|''Nightbringer'']] by [[Graham McNeill]]*³:[[Necropolis (Novel)|''Necropolis'']] by [[Dan Abnett]]*⁴:[[''For the Emperor'']] by [[Sandy Mitchell]]*⁵:[[Death or Glory (Novel)|''Death or Glory'']] by [[Sandy Mitchell]]