Open and common standards are essential enablers for simulation interoperability and re-use. This includes: Technical architecture standards - e.g. HLA - the High Level Architecture, Data interchange standards - e.g. SEDRIS - Synthetic Environment Data Representation and Interchange Specification, and Best practices - e.g. DSEEP – Distributed Simulation Engineering and Execution Process. The NATO Modelling and Simulation Group (NMSG), the NATO Delegated Tasking Authority for standardisation in NATO M&S has developed NATO Standardisation Agreements (STANAGs) in the M&S domain (e.g. HLA and SEDRIS). However, the need was identified to provide and maintain an overview or a “Standards Profile” of existing or emerging standards for M&S, above and beyond the STANAGs, in order to promote interoperability and reuse. This profile includes “de facto” standards, which are not developed by official organisations but have emerged and are in large use within the international community and could be useful in NATO and national activities. The NMSG established the Modelling & Simulation Standards Subgroup (MS3), consisting of NATO and national M&S experts, which were tasked with creating and maintaining the NATO M&S Standards Profile.