NATO relies on standards and agreements. Especially in distributed simulation, standards are evident e.g., AMSP- 01, NETN FAFD, STANAG 4603 and many more. There had been the HLA Federation Compliance Test Tool (FCTT), provided by the USA, but since 2004 there were no more updates available. The NATO Exploratory Team (ET-035) concluded in 2014 that HLA compliance testing is still important and that it needs to be extended beyond the HLA interface and data exchange testing and to address more complex federation agreements and requirements. In conjunction to the development of a new certification tool there is a need to maintain and update the NETN FAFD, as well. The NATO Modeling & Group (MSG-134) began its work in October 2015 and will deliver an Integration, Verification and Certification Tool (IVCT), a Concept of Operation and an updated NETN FAFD in October 2017. During the development of the open source tool, it will be tested in a real use-case of CWIX 2017 at JFTC, in June 2017. The expectation is the broad use of IVCT in NATO and on national level in the procurement process of simulators and by industry during the development process of simulators. Testing and certifying of systems and issuing badges (according on the requirements) will result in an increased interoperability of simulators in distributed networked simulation systems.