I've seen the same 800,000 number, but it was for the CCKW from World War II - not the Reo designed 2.5 truck. I have seen 150,000 units for the M35, but nothing more specific than that for the latter Deuce. I'm assuming that number was just for that one model, since I have never seen a number for the entire G-742 series.
Since the older trucks have essentially been phased out, the feds will probably dispose of them quickly to free up the storage space, reduce their storage cost and most importantly - get some money back! Maybe within the next 1-2 years 99.9% of them will have been sold by GL.
Maybe I should get one this year too?? I'm not sure the GL route is best for me though. Maybe a nice one from a private party sale would be better for my "No Deuce" experience level.