The portion of the worldwide transportation infrastructure that supports DoD transportation needs in peace and war. DTS consists of two major elements: military and commercial resources. These resources include aircraft, assets, services, and systems organic to, contracted for, or controlled by the DoD. DoD's infrastructure, including ports, airlift, sealift, railway, highway, in-transit visibility, information management systems, customs, and traffic management that the DoD maintains and exercises in peacetime, is a vital element of the DoD's capability to project power worldwide. It provides for responsive force projection and a seamless transition between peacetime and wartime operations.