How much military is enough?

The U.S. once regarded a standing army as a form of tyranny. Now it spends more on defense than all other nations combined.
Between 1998 and 2011, military spending doubled, reaching more than seven hundred billion dollars a year—more, in adjusted dollars, than at any time since the Allies were fighting the Axis.
The decision at hand concerns limits, not some kind of national, existential apocalypse. Force requires bounds. Between militarism and pacifism lie diplomacy, accountability, and restraint.