This article examines settler militarism and how it is mobilized through affective practices that ultimately bolster the settler colonial project. With this intent, it develops the concept of ‘militarized atmosphere’ defined as a staged environment where war is positioned outside politics and critical scrutiny through a series of affective manoeuvres and aesthetics. A militarized atmosphere operates through military aesthetics to attune people’s bodies to a position of uncritical validation of a given discourse of war. This article argues that a militarized atmosphere crucially sustains the settler colonial project by removing or reducing contestation around the theme of war, which is a pillar of settler colonialism. In settler societies, numerous Indigenous individuals perceive themselves as embattled and seek acknowledgement of the history and legacy of colonial violence and warfare. In contrast, settler governments have a vested interest in concealing this history and its enduring legacy, and they do so by exalting military warfare as the foundation of the modern nation and creating affective attachments to the military. The article uses the case of Australia to elucidate the argument. It examines how the aesthetics of war commemoration at the Dawn Service, Australia’s major commemorative event, contributes to producing a militarized atmosphere that sustains the Australian settler colonial project. It proposes a framework that links the feminist concept of affective militarism to settler colonialism and contributes to the emerging literature on settler colonialism and militarism.