In a classic study of military performance, Samuel Stouffer and colleagues (1949, 142–49) argue that great familiarity among members of a small combat unit often leads to great courage under fire because the members of the unit are loyal to one another rather than merely to the larger national purpose. In this case, all members incorporate the interests of the others in their own to some extent (see further chapter 6).

Russell Hardin, Trust and Trustworthiness, loc. 953