For mission assurance, Department of Defense (DoD) embedded systems should be designed to mitigate various aspects of cyber risks, while maintaining performance (size, weight, power, cost, and schedule). This paper reports our latest research effort in the development of a next-generation System-on-Chip (SoC) for DoD applications, which we first presented in GOMACTech 2014. This paper focuses on our ongoing work to enhance the mission assurance of its programmable processor. We will explain our updated processor architecture, justify the use of resources, and assess the processor's suitability for mission assurance.