The Space Launch Corporation is proposing to design a low-cost, lightweight flight control system (FCS) for small launch vehicles and interceptors with COTS components. The FCS architecture will focus on the GNC and RF systems as they provide a high degree of commonality for SLV and KKV missions. This GNC/RF suite, known as the NavCom block will be designed to provide complete functionality to the launch vehicle and to the payload through a unique mission-configurable Head-End-Module (HEM). The design approach of the HEM's common avionics suite will be validated through a 6DOF simulation of a typical KKV mission from launch to intercept.