In this fourth episode, Andrew Shearer sits down with Heidi Grant, the Deputy Under Secretary of the Air Force, International Affairs, to talk about why mutual alliances and partnerships matter to the United States Air Force. Topics include the role that allies will play in the future USAF; impediments to greater allied cooperation; prospects for future joint capability development on projects like the F-35; and the challenges of managing long-term international partnerships in an era of budget constraints.