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I would suggest the Beltway Snipers as a perfect example of what armed terrorist can do in our country. With few resources and supplies, they put an entire region in terror.
Also, I think Hasan chose his target[Soldier Readiness Center] for a more pyschology aspect than pure numbers. As a psychiatrist, he knew the doubt he would create in departing soldiers, who they could 'trust' when deployed.
If our government cannot recognize and deal with a terrorist in their midst, we have serious problems. this guy was walking around in Muslim clothing in the store, spouting his treason around the military compound, and evidently making threatening comments on the internet. The Army better check out these Muslims in the service, especially if they are spouting treason. Muslims are true to Allah, not the US of A.