- The Laser, Gunnery Trainer is a training device which will mount in the M73 Machine Gun Mount of the M48A3 Tank, M60 Tank, M60A1 Tank and AR/AVV M551 and permit year round training indoors or outdoors in the techniques of zeroing, accuracy and rapidity of laying the gun using direct fire sights. The Laser, Trainer M55 in conjunction with the Trainer, Field Artillery; Direct Fire (laser): 11146409 is used in training Howitzer Sections on the 105-MM Howitzer M102 Towed, 105mm Howitzer M101 self-propelled, 105mm Howitzer M114A1 Towed, 155mm Howitzer M109A1 self-propelled, 105mm Howitzer XM204 Towed and the 155mm Howitzer XM198 Towed. The trainer will provide year-around training of section personnel in standard direct fire techniques while engaging both stationary and moving targets on a scale range. The trainer will allow realistic firing exercises to be conducted in garrison, without having to move howitzers to a live firing range and without expanding either sub caliber or service ammunition.