This paper addresses issues in interconnecting military command and control (C2) and simulation systems, using Web technologies and mediation via a common representation, the Command and Control Information Exchange Data Model (C2IEDM). The authors supported a NATO Exploratory Team that designed an experimental program to assess the approach and prepare for its use by coalitions. As part of that activity, the United States and France implemented an international demonstration of C2 and simulation systems interoperating using Web Services and C2IEDM. This paper reports on how C2 and simulation systems were employed with Web technologies to achieve a successful demonstration in a very short time period, including experience gained in the process and plans for future development of C-BML capabilities.