"Siebold (2007) describes the “standard model” of cohesion as involving peer (horizontal), leader (vertical), organizational, and institutional bonding, each having an affective component and an instrumental component. He focuses on the role of trust and teamwork, as well as self-interest, in building cohesion: The essence of strong primary group cohesion, which I believe to be generally agreed on, is trust among group members (e.g., to watch each other’s back) together with the capacity for teamwork (e.g., pulling together to get the task or job done). [p. 288] . . . Combat group members try to develop strong bonding as a collective good, at least in part, because it is in their own self-interest for survival to do so. [p. 289] . . . While it is true that a few researchers have focused on intimate personal bonds and informal rituals, I submit that the majority of researchers . . . have used some form or part of the standard model in their approach, especially during the past twenty years, which does not dwell on intimate relations or masculine rituals but rather emphasizes interpersonal trust and teamwork built through many experiences including arduous training and drills. [p. 291] . . . [M]ere friendship or comradeship is not the essence of cohesion. [p. 292]"