Chapter 5 discusses routines of the US Army, the British Army, the German Army, and the Italian Carabinieri, up until late 1995 when NATO began its new mission in Bosnia. The focus is on the extent to which these militaries had routines for coping with unconventional problems such as crime and asymmetric war. Given the stickiness of routines, the repertoires of tasks that militaries were performing for decades (or centuries) before the end of the Cold War can be expected to inform military behavior in post-Cold War missions. The chapter explores the sources of organizational routines, focusing on historical experience and the domestic political environment. It shows that routines are institutionalized in formal rules, training and education, and artifacts, and it underlines how routines vary across the select military forces. Moreover, the chapter formulates expectations as to how the respective routines impact local populations at sites of intervention. For example, the British Army and Italian Carabinieri can be expected to be more proficient in supporting law enforcement than the US Army or German Army.