“There’s just not enough dollars available at any moment in the history of this nation to have zero risk.”— Army Secretary John McHugh on Tuesday, speaking about the balance that must be struck between risk and military spending. That, in a nutshell, sums up the debate now underway over future levels of U.S. defense budgets. Many Americans want zero risk – or as close to zero as they can get – without heed to the costs incurred.