“…From a theoretical point of view, these two groups of factors reflect Charles Moskos’ I/O theory of military professionalism, which distinguishes between institutional (intrinsic or “soft”) and occupational (extrinsic or “hard”) factors (Moskos, 1977, 1986). Commonly identified extrinsic factors are economic variables such as employment status, income, duration of unemployment, job safety or the military’s institutional presence (Dale & Gilroy, 1983; Kilburn & Klerman, 1999; Kleykamp, 2006), whereas intrinsic factors commonly address ideational motivations such as patriotism, the desire to serve, altruism, and self-enhancement goals (Griffith, 2008; Woodruff, 2017; Woodruff et al, 2006; Yeung et al, 2017).…”