What makes a mercenary a mercenary? This pilot project aims to address this question to establish an operational framework to assist both scholars and policymakers in distinguishing between types of private security forces (PSF). PSFs are under scrutiny by the international community for committing human rights violations and for acting against self-determination, often in the context of intrastate conflicts. This disillusionment with PSFs is historically unprecedented, as PSFs have been utilized in inter and intrastate conflicts for centuries. Current literature has produced simplistic views of PSFs as detrimental forces in conflict zones, often categorizing all PSFs as "mercenaries." This perception has limited the potential utility of PSFs, as human rights violations and acts against self-determination are not unique to PSFs nor constant. Without distinctions between types of PSFs that differentiate groups based on their operations and utility, regulations against PSFs will remain inefficient. The title of mercenary is a contentious term. At the most basic level, a mercenary is a hired independent nonstate actor that in some way supports a military operation. But how can Halliburton which operated truck convoys and cafeterias in Iraq, the Wagner Group which only agrees to contracts when directed to by the Russian government, and Executive Outcomes which have aided state governments against rebel forces in Africa all be classified as mercenaries (Hartung 2011, 5; Marten 2019, 191; Howe 1998, 316)? The usage of mercenaries has occurred since the inception of currency-based markets, recent scholarship has formulated definitions explicitly or casually through analyses of specific cases (Brewis and Godfrey 2017). This research has resulted in conflicting definitions of mercenaries under numerous monikers, such as private security contractors (PSC) or private military contractors (PMC) (Percy 2003; Singer 2008). These analyses often approach this issue with predetermined interpretations of these groups as a monolith: mercenaries violate state self-determination and prolong conflicts in order to extend their own contract and pay (UN 2021). This results in a dilemma for analyses of these actors, as the evaluation of these groups involve parameters that do not capture the specific qualities of PSFs. For this analysis, the term private security force (PSF) is employed to refer to the actors that are categorized as mercenaries. Private insinuates the independence of these groups from a state, security is in reference to the defensive or offensive operations of these groups, and force connotates a body of people conducting some action in a conflict. This article will refer to the different types of PSFs with this comprehensive term. Further, discussions of PSF contracting requires common terms to identify the actors involved, with contractor being a PSF group, contractee being individual members of the contractor, and the hiring group being the state or organization that has acquired the services of a contractor. I identify three main types of PSFs for this analysis: the previously mentioned PMC and PSC and a new classification, private logistics contractors (PLC). The difference between these contractors is their typical operations. PMCs are characterized in their tip of the spear role in military operations, as their main usage by states is to directly engage in offensive front-line operations, hence the military designation. PSCs typically act as auxiliary forces; while being capable of front-line operations, their usage is generally oriented towards defensive operations for already achieved objectives. PLCs act as logistical support for military organizations, generally facing less risk of direct combat than the other designations but still is capable of combat if need be due to operating in a conflict zone. Distinctions between types of contractors in terms of their operational orientation are still not sufficient however, as all three types of PSF vary in capabilities. Considering these groups are hired to compliment or even replace the services usually provided by the national military, states are likely to carefully evaluate PSFs to select the group that best matches their need that cannot currently be fulfilled by the state's national military. Thus, amongst PMCs, PSCs, and PLCs, I argue that they vary in their degree of utility as a contractor. In this sense, a contractor is not expected to replace a national military outright; instead, contractors have innate utility for states that national militaries do not possess. This utility of a contractor is multifaceted and can therefore not be captured in the same way as national military utility, this will be elaborated on further in the theory section. This article will analyze mainstream definitions of PSFs to form a more comprehensive evaluation system for such entities, as past literature has indirectly evaluated these groups in their attempts to define them. The article will begin by examining current literature on PSFs and four common aspects that measure PSF utility. This will result in the formulation of four evaluation axes of PSF utility: authoritative control, group motivation, internal organization, and reliability. The methodology section will then assert the usage of a diachronic crosscase study analysis to test the four-dimensional evaluation of PSFs and justify the usage of five PSF cases. An analysis will then test this evaluation system by applying it to the five PSF case studies. These findings will then be examined in the discussion which will provide recommendations for further research and how the distinctions made in this article between PSF groups and further in-group variation can help guide said research. [ABSTRACT FROM AUTHOR]