You're not a moron, but the purpose of a standing army is to protect the nation from future attacks. Right now we've had to tap into our national guard troops to perform the role of the standing army, and we're involved in only two small operations (yes, they are small compared to what our military is suppose to be able to sustain). The army is suppose to be able to sustain a large two-front war. Right now we cannot meet that obligation since we reduced the funding of the military and redirected funds that would have paid for an extra 100K troops and placed it into high-tech weapons. Now, we do need these weapons to maintain the strategic advantage, but we also need the people to use them.
I understand what you're saying, but aren't you establishing a cold war doctrine to the 21st century? IIRC, the two ability to sustain two wars was based on a hypothetical Warsaw Pact vs. NATO World War III, in which the United States would have to defend Western Europe and some other strategic point that the USSR would need to take, such as South Korea or parts of the Middle East. With no Cold War, I fail to see how that doctrine is still relevant.
But yeah, I see what you're saying. Our army is streched far too thin with our commitments in Iraq and Afghanistan, with National Guard troops doing things, they well, shouldn't be doing. I think that this expansion would have been more prudent before invading Iraq, however.