SMFLS4: The Sustainment & Multifunctional Logistics SMARTbook, 4th Ed. is the fourth revised edition of The Sustainment & Multifunctional Logistics SMARTbook. In addition to the most current versions of ADP/ADRP 4-0 Sustainment (Jul '12), SMFLS4 incorporates the full scope of new material from ATP 4-94 Theater Sustainment Command (Jun '13), ATP 4-93 Sustainment Brigade (Aug '13), ATP 4-90 Brigade Support Battalion (Aug '14), Sustainment Planning, JP 4-0 Joint Logistics (Oct '13), ATP 3-35 Army Deployment and Redeployment (Mar '15), and more than a dozen new/updated Army sustainment references to include ATP 4-33, ATP 4-42, ATP 4-16, ATP 4-0.1, ATP 4-34.40, ATP 4-92, FM 1-0, FM 1-04, FM 1-05, FM 1-06, FM 4-01, FM 4-02, and FM 4-30! The sustainment warfighting function is related tasks and systems that provide support and services to ensure freedom of action, extend operational reach, and prolong endurance. The sustainment warfighting function consists of three major elements: logistics, personnel services, & health service support. Unified land operations acknowledges that strategic success requires fully integrating U.S. military operations with the efforts of interagency and multinational partners. The sustainment of unified land operations requires a continuous link between the strategic, operational, and tactical levels. It also requires close coordination and collaboration with other Services, allies, host nation, and other governmental organizations. Decisive action is the continuous, simultaneous combinations of offensive, defensive, and stability or defense support of civil authorities tasks. Commanders seek to seize, retain, and exploit the initiative while synchronizing their actions. Sustainment, through mission command, enables decisive action. Sustainment provides the operational commander with operational reach, freedom of action and endurance.