What do people in liberal polities believe they owe soldiers for their service? The UK’s Armed Forces Covenant, promulgated in 2000 and enshrined in law in 2021, presents a real-world opportunity to examine the effects of inducing citizens to reflect on soldiering. We develop and test two contending theoretical logics, grounded in the liberal political culture from which the Covenant emerged, using unique observational data and a novel survey experiment. Does prior knowledge of the Covenant or exposure to a Covenant prime highlight the abiding tensions between liberal ideals and military service and underscore the debt that citizens owe soldiers? Or does it prompt liberal citizens to resolve their discomfort with military service in a distinctively liberal way – by emphasising soldiers’ contractual terms and their willing consent to deployment? In line with the latter logic, respondents with prior knowledge of the Covenant or exposure to the Covenant prime were more likely to endorse the use of force and were less sensitive to casualties, and they were no more likely to grant soldiers and veterans additional benefits or preferential treatment. This paper has significant implications for public support for military missions and the relationship between military service and citizenship.