Does contact between people from different social classes increase support for policies aiming to reduce inequality? The scarcity of research addressing this question, as well as the shadow of self-selection looming over most of it, calls for more research on the relationship between inter-class contact and political attitudes. I contribute to this field by examining an unexplored institution in the existing literature: compulsory military service. A diff-in-diff approach, focusing on Spanish cohorts close to the removal of conscription and with females as the control group, reveals that males born in conscripted cohorts are significantly more likely to support redistribution. I present placebo tests discarding that these findings merely reflect a differing trend between genders in a broader set of political attitudes. Furthermore, I rule out plausible alternative explanations as well as present two manipulation checks indicating that the removal of conscription did indeed reduce inter-class contact among males.