What's the point in the Army developing its own, parallel autonomous vehicle technology? Why not just have DARPA funnel funds to Google or someone and piggyback off their research?
I'm 95% certain that each one of the vehicles there was produced by contractors for a government agency (and if these particular vehicles weren't, certainly such contracts do exist- I used to work on one). If Google wanted to compete for a contract it certainly could, but its experience isn't particularly helpful in attacking the problem set that the Army is interested in.
Also, combat zones != California suburbs.
We're just going to leave that one tee'd up, aren't we?