This new ATIS standard addresses the 5G supply chain (5G/SC) as a critical function in the design, build, deployment, and operation of 5G assured networks. It focuses on the requirements and controls necessary to operationalize a set of agreeable levels of assurance associated with the lifecycle functions of high assurance 5G/SCs. This is based on a flexible reference model and component flow through the complex 5G/SC to identify specific controls that can mitigate the identified threats and associated attacks.