The transformation of the U.S. Armed Forces presents many challenges for those charged with upholding the sustainability of military installations.One of these challenges is ensuring that the operational needs of an installation can be met efficiently while balancing future needs with the sustainable use of the natural resources available.Thus, an approach and tool are necessary to assess an installation’s capacity, costs, and use of resources in order to meet mission requirements.The Army Basing Study Office and the Army Environmental Policy Institute co-sponsored ESG in the development of this capability, IREM. ESG provided advisory and assistance services to support the Department of the Army Headquarters by developing, testing, and applying a methodology for analyzing the costs to sustain and potentially expand the carrying capacity of land, energy, water, and waste treatment resources and associated infrastructure requirements.IREM links installation and operational requirements with resource and environmental carrying capacities and costs (both within the installation and region-wide).Resources that are included in the analysis are water quantity (local and regional); electricity and natural gas; training land; wastewater treatment; solid waste disposal; and air quality.IREM also identifies and assesses ways to address capacity shortages and their associated costs.