ABSTRACT This paper highlights the perspectives of defence workers regarding a Just Transition of their industry, one of the most environmentally harmful sectors in terms of greenhouse gas (GHG) emissions, pollution and use of non-renewable resources. It is based on (i) interviews with defence sector workers in the United States and the United Kingdom (n58); and (ii) focus groups with key representatives of national and international labour unions, defence companies and relevant NGOs (n18). Some of these defence workers and their trade union representatives envisioned a transformational path towards sustainability, including converting the defence sector to more socially useful production. Drawing on Gramsci, we define these as ‘counter-hegemonic views’, since they challenge the hegemonic ‘growth coalition’ and ‘treadmill of destruction’ paradigms. Such views support and echo more radical interpretations of Just Transition, emphasising the necessity of a structural transformation of society to achieve a fair and effective transition to sustainability.