Journey the world of Mission Critical Services through the history of Nemergent and NIST PSCR. See their collaborations from an architectural perspective, highlighting the outcomes of each project in the development of a standard-based Mission Critical System that supports public protection and disaster relief activities. Participants will learn and see the enhancements and development of several elements that are the base of the Mission Critical Services (MCS), such as MCS client, MCS Application Server, Ancillary Servers, InterWorking Function, and Inter-MCX capabilities.