This standard defines the data messages, known as PDUs, that are exchanged on a network among simulation applications. The messages are organized within specified domains called protocol families. The protocol families included in this standard include Entity Information/Interaction, Warfare, Logistics, Simulation Management, Distributed Emission Regeneration, Radio Communications, Entity Management, Minefield, Synthetic Environment, Simulation Management with Reliability, Information Operations, Live Entity Information/Interaction, and Non-Real Time. Future versions of this standard may contain additional protocol families or PDUs to exchange information about interactions and functions not currently supported.