The United States has not fully leveraged its allies and defense partners in the space domain. This is partly due to significant obstacles, like classification and releasability, that have impeded more and deeper defense space partnerships. It also reflects the legacy of the Cold War, a period when space was dominated by a few major powers. A new space era is upon us. Allies and partners are developing significant space systems that can enhance U.S. capabilities. Concurrently, potential adversaries are developing weapons that could threaten U.S. and allied assets. The seriousness of the threat demands a more concerted and international approach. In this new space era, U.S. leadership should treat defense space partnerships as a strategic priority.