2-39. SDDC is an operational-level Army force designated by the SECARMY as the ASCC assigned to USTRANSCOM and a major subordinate command under administrative control of USAMC. SDDC exercises administrative control authority and responsibility on behalf of the Commander, USAMC and exercises OPCON over Army forces, as delegated by the Commander, USTRANSCOM. SDDC is the global ocean and inland waterway port manager and surface transportation service provider as part of USTRANSCOM’s Joint Deployment and Distribution Enterprise. The Joint Deployment and Distribution Enterprise is a collaborative network of partner organizations, to include DOD components, sharing common deployment and distribution-related goals, interests, missions, and business processes, which comprise end-to-end deployment and distribution in support of CCDRs.