ANG KC-135s require an automated hardened position, navigation, and timing (PNT) system integrated into the existing navigation equipment. ANG KC-135s fulfill almost 70% of the nuclear and USTRANSCOM refueling missions. KC-135s require the ability to navigate in a post-strike environment where traditional navigation aids and satellites would not be available. In addition, the KC-135 will be required to operate in a contested environment against a peer adversary. An alternate multi-modal navigation system should provide the greatest accuracy and a bounded position error over an extended use-time and distance in a contested and degraded environment. Solutions should provide organic PNT updates. These systems are autonomous, passive, non-jammable, and automatic. All 166 ANG KC-135s require automated, hardened PNT systems.