Looking ahead to the Department of Defense’s (DOD’s) fiscal prospects and security challenges in the second half of this decade and beyond, the Services and their partners will have to find ever more ingenious ways to come together. It is time for us to think and act in a more ecumenical way as we build programs and capabilities. We should build stronger ties, streamline intelligently, innovate, and wisely use funds at our disposal. We need a broader conversation about how to capitalize on each Service’s strengths and “domain knowledge” to better integrate capabilities. Moving in this direction is not only about savings or cost avoidance; it is about better warfighting.