I believe it was a joke, my friend, because "did not do enough" and "did too little" mean exactly the same thing.

If it's secret, then how can you know it doesn't exist? =)

But seriously, I can't imagine that they would spend billions on this airplane, with all its missile countermeasures and million-dollar tables and all that, and not include a weapons cache "just in case". Considering the military bent of our government, it would seem counter to its nature.