The NEC CCIS System Support Centre just released "NEC CCIS - a NATO Air C2 System". This is an updated version of the NEC CCIS whitepaper formerly known as "An introduction to NEC CCIS", and is a detailed description of the NEC CCIS C2 system, its operational capabilities and its governance. The document is a very good place to start if you want to read up on the NEC CCIS C2 system and its community. The document is available via this link.