Nextel Aerospace Defence & Security (Nads) is a leading Systems Engineering company. Since 2002, Nads has provided software & highly specialized systems engineering services to the main industries of the European Mil/Aero market. Nads targets the market with its own suite of standard-compliant engineering tools for modelling & simulation developers, as well as COTS software components which help systems integrators to develop interoperable Network-Centric, C4ISR and Combat Systems. Among its latest innovations are the application of the DDS Standard in Distributed Computing within Disadvantaged Networks as well as in Distributed Simulation. Nads sells software components which easily integrate HLA-federation in DDS-compliant networks.