This paper discusses the goals, challenges, and lessons learned from integrating an established shore-based, force-level simulation system into the shipboard combat system environment. The results of this effort were demonstrated at the Fleet Combat Training Center (FCTC), Pacific, and the Tactical Training Group, Pacific (TACTRAGRUPAC) in May 1990. Real training platforms included Aegis, Spruance, and Perry class ship mockups. Simulated platforms included enemy and friendly submarines, fixed and rotary aircraft, and surface vessels all operating in a war-at-sea scenario.