This study will provide a comprehensive assessment of the burden and costs of operative and non-operative obesity care across all regions in the U.S. where the Department of Defense (DOD) authorizes care. The development of economic assessment tools will allow health policy experts, purchasers and payers of healthcare, clinicians and patients to determine the utility and cost-effectiveness of available treatment strategies. These economic considerations are relevant to the competing crises of spiraling health care costs and the loss of productivity related to obesity.