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The Department of Defense (DoD) Global Information Grid (GIG) is the future information architecture for military users. The deployment of the GIG will require that performance is understood with respect to applications (service-oriented architecture), information transport, information assurance, and other attributes. This is a complex task due to the size of the GIG and its heterogeneous nature. An approach for emulating these elements has been developed in the Johns Hopkins University Applied Physics Laboratory (JHU/APL) GIG Test Bed (GTB). This GTB has been used to evaluate performance of transport and applications. This paper will describe the concept, methodology and example results of the benefits of such emulation, as well as future areas of research and development.