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We study the current architecture of the grid and Web services and that of the global information grid (GiG) with the Network Centric Operations and Warfare (NCOW) from the Department of Defense. We compare the GiG core enterprise services with those being developed for Grids (the open grid services architecture) and Web Services (so called WS-* specifications), identifying both similarities and differences. We discuss both modeling and simulation with HLA (high level architecture) and broad defense NCOW applications. We illustrate this analysis with an open geospatial community (OGC) compatible set of geographical information system grid services. We illustrate the use of grids to efficiently support realtime simulation by an application of grids to audio-video conferencing.