Check out the pictures of my P-40K that I just posted in the Aircraft Forum. The upperside is supposed to be Desert Pink, the same as on B-24s in that theater of operation. I used Floquil US Sand enamel, which might be hard to come by now. I don't know how accurate or exact the match is with true Desert Pink, but I like the color.
You might want to look into the Xtracolor enamel line. They have a color called Desert Pink, although I think it's refering to a more modern color as opposed to WWII. I have not seen the color personally, so can't vouch for how it looks.
Another option I considered was using Model Master FS 30219 (I believe it's a tan color), with some white and yellow mixed in to give it a pinkish hue. This was a mix that someone recommended, and the results I saw on a B-24 looked nice.
I mainly paint with enamels, so have more info on them as opposed to acrylics.
Hope this helps,
Mark