The U.S. Army consists of two distinct functional components: soldiers serving in combat roles, on the one hand, and those who serve in support positions, on the other. Do these two functionally distinct segments differ culturally as well? Empirical researchers utilizing qualitative methods have supported a ''Two Armies'' concept. This article examines the phenomenon quantitatively by using a nationally representative sample of the active duty population. The authors find that there is a statistically significant difference between support and combat soldiers that holds even after taking into account differing demography. Interestingly, this is true mainly of White soldiers, and the authors find that it is driven by premilitary, civilian socialization. This dataset also clearly shows that, for most soldiers, the split between the two segments of the Army tends to diminish over time, with combat and support soldiers sharing more similar motivations with one another later in their terms of service.

The phrase outsourcing war has been used since the late 1990s to describe the trend toward the hiring of private military and security companies (PMSCs) by national governments to perform functions that previously had been assigned only to members of national military forces. These private companies, in turn, hire employees, usually on limited-term contracts, to carry out the missions that the companies have agreed to accomplish. PMSCs may undertake combat missions independently or in direct cooperation with deployed national military forces. They may be assigned to security missions in secret or to meet a highly visible demand, as in the case where the United States contributed private military contractors to the United Nations peacekeeping force in Kosovo in 1998. This was an early case in which privately contracted military employees were hired by one nation to function cooperatively with uniformed members of other national military forces. During the 20th century, private military forces had been considered a form of organized crime populated by mercenaries, a delinquent group at the fringes of the social order who traded in violence to advance the interests of anyone willing to pay them. By the beginning of the 21st century, however, the outsourcing of war and security functions to private companies had become commonplace, transforming the previously prevailing belief that only states had the right to wage war. States often deployed their militaries alongside PMSCs who were contracted to provide support to forces on the ground. In other cases, private companies would pay representatives of other private companies to defend their assets, such as oil fields or diamond mines. During this period at the turn of the 21st century, PMSCs came to be perceived as representatives of a legitimate industry. With this transformation, the nature of security and modern conflict changed as well. Private military and security companies became an important instrument in war-making and the projection of power.

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