Something seems amiss here. From the driver's view I can get NVG views in the M901, M113A2 and M60A3. I have not figured out the exact sequence for any but "zooming" while in the driver's view, hitting the "TIS" button and "going up" in the hatch works, most of the time in the M60A3. Zooming from the closed hatch view of the M113 series and hitting "TIS" works also.