There has never been a military in the entire history of the human race that has gone to war equipped with more than the least that it needs to fight its enemy. War is expensive. It costs money and it costs lives and no civilization has an infinite amount of either. So when you fight, you conserve. You use and equip only as much as you have to, never more.

The reason we use force...is that force is the easiest thing to use. It's fast, it's straightforward, and compared to the complexities of diplomacy, it's simple. You either hold a piece of land or you don't. As opposed to diplomacy, which is intellectually a much more difficult enterprise.