The Naval Training Systems Center has developed a low cost marksmanship expert trainer, MET, that allows low cost marksmanship training without an instructor, real weapon or rifle range. The system is safe and does not use costly ammunition. As part of this program, a special long range light pen was developed. The U. S. Navy is currently contemplating the use of this system to teach marksmanship in the Navy's Recruit Training Centers. Teaching marksmanship has required live rounds, special ranges, and a large number of instructors. At present, Navy investment in real estate in close proximity to recruit training centers to construct rifle ranges would be difficult. Also, a large number of experienced instructors would be needed and the high cost of live rounds will add greatly to the Navy's training budget. This paper describes the MET system and the technology applied to this new rifle marksmanship training device. An expert system has been developed to alleviate both the cost and shortage of instructors. The expert trainer is controlled by a personal computer, the Zenith 248. The MET collects real-time shooter performance data or facts, and then executes rules that analyze the trainee performance. Trainee feedback is provided on the computer monitor and by a computer generated voice. The feedback describes the source of shooting errors including improper sight picture, poor shooting position, incorrect trigger squeeze, and incorrect breath control. Through detailed guidance, the novice is able to transition to marksman.