Due to numerous instances of police brutality in the U.S., researchers and policymakers have urged police to shift their job orientation to become more guardian-oriented (i.e., prioritizing community safety and building relationships) and less warrior-oriented (i.e., prioritizing physical control and fighting crime). Using the group engagement model and the expectancy disconfirmation hypothesis, this study examined: (1) young adults’ desire for police to be warrior- or guardian-oriented, (2) their perceptions of the extent to which police in their community are warrior- or guardian-oriented, and (3) the association between participants’ perceptions of the discrepancy between what police in their community should be versus are perceived to actually be and police legitimacy. In this study, a racially and ethnically diverse sample of young adults aged 18-25 in the United States (N = 436) responded to a self-report survey. Participants preferred police to have more of a guardian than warrior orientation and reported that police are not as guardian oriented as they wanted them to be. Further, if police did not meet their guardian expectations, young adults had more negative perceptions of police legitimacy. Expectations for police behavior may influence police legitimation and, within the context of police reform, young adults support the call for police to be more guardian-oriented by prioritizing community safety and building relationships. Fostering a guardian orientation in police is particularly important for police departments that are interested in promoting perceptions of legitimacy among the communities they serve.