Information and intelligence-and the degree of access to and control of the systems within which the data reside-can yield power and influence at scale. These systems and the networks they create collectively make up digital infrastructure (DI). Spawned from internet growth and the interconnectivity of global telecommunication networks, today's DI-and a country's ownership of, access to, and control over it-has emerged as an area of competition between the United States and China. Beijing and Washington rely on DI to support military forces and use its capabilities to expand national power and extend influence globally. Both countries now aim to shape the DI in ways that align with their long-term strategic priorities and interests. This report defines DI, characterizes the competition for it, and provides evidence showing that how DI evolves carries implications for long-term military competition and conflict. The authors also describe important trends and asymmetries shaping the competition and conclude by discussing the implications and opportunities for the U.S. government and the U.S. Department of Defense.