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Smaller states face conventional force strength asymmetry against larger states like Russia and, it is in their interest to find ways to mount an effective and multifaceted resistance. Being able to sustain operations on occupied territory against an occupying force could be one of these ways. These operations can be categorized as part of a state’s special operations capacity and furthermore sub-categorized as unconventional warfare. Military logistical theories are based primarily on logistical supply chains where the force largely has its own geographical control or dominance. However special operations in occupied or enemy controlled territory faces the challenge that the geographical area is controlled or dominated by the enemy, effectively blocking sustainment, the question then becomes: How can sustainment for a military force, operating in enemy controlled territory, be achieved?

The aim of this study is therefore to make a contribution to theoretical military logistic literature by conducting a theory developing study. This by deductively developing a tentative theoretical framework from existing theories of conventional military logistics combined with special operations theory. The framework is then tested in a qualitative multiple historical case study by using the cases as a testing ground for the theory.

The study concludes that the logistical options (methods) needed to sustain the unconventional force are determined by taking into account operational environmental factors such as geography, climate and enemy actions in order to achieve physical access and concealment for supplies. Together access, concealment and planned combat events influence the choice of logistical option or combination of options and as result a build-up time of supply levels is needed before sufficient sustainment is reached. Furthermore, this build-up time is always present no matter if the unconventional operation is planned or not. But, an advantage in force availability and execution exists when planning and preparing campaigns.