The United States, United Kingdom, and Australia have signed a historic agreement that will allow Australia to operate and potentially construct nuclear-powered submarines. This cooperative engagement reflects, in part, the ongoing pivot to and importance of the Indo-Pacific region as well as the critical need for resources and assets to counter anticipated challenges in the area. It also highlights the United States’ willingness to shift from its initial posture regarding naval nuclear propulsion technology, opting instead to begin sharing technology that benefits a number of interests within a band of allies.