Replication Data for: Are the U.S. Military’s Nonpartisan Norms Eroding?

The U.S. military’s nonpartisan norms are important for healthy civil-military relations. Some research, however, suggests these norms are weakening. This study examines the evidence for eroding nonpartisan norms by analyzing U.S. military servicemembers’ partisan affiliations and political activism levels from 2008 to 2018. It finds that since 2008, military servicemembers have become more likely to identify as partisans. Servicemembers have also become more politically active than civilians, although this is due to decreasing activism among the American public. It also finds that longer-serving service members have stronger nonpartisan norms, but that newer servicemembers are more politically active than both longer-serving servicemembers and civilians. These findings provide a firmer empirical foundation for previous claims of eroding norms and suggest more research is needed to understand how increased partisanship and political activism impact military readiness and civil-military relations.