You might want to try what I did. My M35A2 came from the PA National Guard. I received all of my information from Carnac on the vehicle and confirmed it by sanding. Like yours, mine was somewhat difficult to read after sanding. I googled the unit, got the unit's telephone number, and called them. I got hold of a Major who was actually familiar with my truck. Told me all kinds of stories as to where the truck had been over the years, and the vehicle number. He also e-mailed me a complete history of the unit. I had to go through several highly suspicious people before I got to someone that could help, however.