B24D FS help

You may not find a trus "FS" color number for that one.  The FS color standard was adopted in 1956.  This Link gives a bit of history on the standard.

I'm not up on the WWII colors, but I think they used the "ANA" (Army Navy Aeronautical colors) standard back then

IIRC, I think Floquil used to make that exact color. Since they discontinued the military stuff it will be hard to find but if you have a LHS that carries the current stuff they might have some old stock left over.

This link may help you out.

http://www.simmerspaintshop.com/colours/USA.html

Look for Sand (Desert Sand)