Today, for example, instructors from the Navy’s "Top Gun" school routinely train with their counterparts at the Air Force Weapons School. As part of Air-Sea Battle we are pursuing this type of inter-service cooperation between all the services, as well as within each branch of each service. Just as in tactical aviation, we are expanding our doctrine integration to include additional areas of collaboration — such as Army air-defense forces and Marine reconnaissance units. With the doctrine, procedures, investment, and training included in Air-Sea Battle’s initiatives, we are moving from cooperation toward integration across domains. To foster integration we are directing an intensified approach to building common procedures, complementary budgets, combined exercises, and joint war games.