Army Techniques Publication ATP 4-94 Theater Sustainment Command June 2013 Army Techniques Publications (ATP) 4-94, Theater Sustainment Command, is the revision of FM 4-94, Theater Sustainment Command. ATP 4-94 provides an overview of the theater sustainment command (TSC) and an expeditionary sustainment command (ESC)'s roles, and functions, information on strategic partners, the organization, and guidance within the context of decisive action. ATP 4-94 establishes Army doctrine for operational-level theater deployment and sustainment by providing overarching doctrinal direction for Army operations conducted in support of unified land operations. Major changes from FM 4-94 include clarifying the role of the ESC within unified land operations, primarily, that the TSC can deploy an ESC when the TSC determines that a forward command is required, or when task organized directly under the mission command of a Corps or Army forces (ARFOR). ATP 4-94 also introduces Global Combat Support System-Army materiel management levels. This is a fundamental materiel management information system change, which is being fielded to the total Army force. Introducing the materiel management level responsibilities will allow materiel management at all sustainment levels to understand changes being made to the information system infrastructure, and their roles and responsibilities.