National Forest or Air Force C10?

[slns831]

Hello,

I'm trying to determine if my 70 C10 was a US National Forest or Air Force truck? I'm trying to decode the SPID to determine the paint colors and I'm also trying to find out the orginial lettering on the doors? I'd like to find out what the letterings on the doors where so I can place a decal and scuff if out to look old? The person who previously owned the truck may have painted the top gray as I'm thinking the top may have been white? I do know that the drivers side door is not the original door? It was white then repainted to try to match the rest of the truck. Thank you.