The Simulator Complexity Testbed (SCTB) is a highly modular flight simulator for experimental research focused on US Army Aviation advanced rotary wing combat. A major component in the development of the helmet mounted fiber optic display media for this device is an eye slaved area-of-interest (AOI). In order to provide for an accurate, reliable, and robust helmet mounted eye tracker to support proper system operation, the engineering development of competing eye tracking designs was initiated under a cooperative US Army/US Air Force/Canadian cost shared development program. This paper describes the overall design of the SCTB eye slaved, servo driven optical system and discusses the issues involved in its development.