This report describes the design, development, and evaluation of a training device intended to enable ground-based practice of equipment operation and target-tracking skills that are required by the Forward-Looking Infrared (FLIR) and Low Light Level TV (LLLTV) sensor operators assigned to Gunship II aircraft. This trainer makes use of a relatively unique approach to tracking training by using video tape which is electronically manipulated so as to allow tracking in both simulated wide and narrow-angle fields of view similar to actual equipment. (The complete description of the video equipment is provided in AFHRL-TR-72-41.) In addition, the trainer incorporates both actual and mockup instruments that enable the trainee to practice equipment operation procedures and malfunction isolation and correction. The evaluation of the training effectiveness of this device showed that sensor operators who received practice on this device reached the desired skill levels for both equipment preflight and target tracking sooner than those who had not received such training. As a result of the demonstrated value of this device, the using organization has incorporated it into their formal training curriculum. (Author/NF)