This book explores the sustainability concept at the strategic, operational and tactical levels. At the strategic level the book explores the importance of focusing international and national priorities on identifying and preserving the resource base necessary to maintain security and stability and discusses the importance of proactively mitigating threats to these resources. At the operational level it examines the great savings that can be achieved by applying sustainable principles and practices throughout military installations, systems, and operations; Operational Energy is a fine example. At the tactical level sustainability is reducing risks to military war fighters by reducing the logistic burden of transporting fuel and water to the tip of the fighting spear, and by minimizing the overall logistics footprint at base camps. In the field, the military is additionally a catalyst for the enhancement of sustainable communities through its application of green technologies and human capacity building.