That's interesting as I didn't realize that the US used any CMPs. The one that's stuck is a 2 wheel drive Ford F15 with ID829720 stenciled on the front bumper. It has the 2B1 box which would make it a 1942 model.
The canteen truck is an F60 serving under the Delta Service Command, whatever that is. It doesn't have a roof hatch which is a little bit unusual for the time period but then a canteen truck at an air force base might not need it's own aircraft protection.
You can tell they're both Fords by the push bar setup. On the F15A you can also see the Ford horn and the shape of the grille emblem.
Why won't it let me post the pictures?
I was using my Firefox browser and it wouldn't show the Manage Attachments button so I tried my Netscape 9 browser and there it was. That's hard to figure!