The DMO Portal serves as a mechanism to bring simulators using different simulation protocols into a common battlespace. Integration testing of the first HLA simulators with the legacy DIS components has some implications for dead reckoning implementation that arise from the nature of HLA state updates. They do not occur in homogenous DIS or HLA environments. The authors describe the observed anomalies and the implementation developed for the DMON to address them, as well as test cases and procedures that help isolate the discrepancies