Planetary Defence Forces
From Lexicanum
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A Planetary Defence Force (or PDF) is an individual Imperial world's governmental military. Imperial worlds have their own government separate from that of the Adeptus Terra, though they are still part of the Imperium, and planetary governors are obligated to efficiently run the world on behalf of the Imperium and to protect it from threats.
Part of this obligation is that every world of the Imperium is required to possess local military forces for its own defence. The PDF also acts as a source of trained soldiers for recruitment into the world's tithe of Imperial Guard. The PDF is an Imperial planet's first line of defence against invasion and internal rebellion, and can vary in quality from well-equipped units the equivalent of an Imperial Guard regiment to poorly-armed militia.
