I don't think it's all of one and none of the other.
If you're going to put boots on the ground, like we have in South Korea, you need a heavy infrastructure, superior airpower.... I don't think there are many cyber battles happening in Iraq right now.....
Having said that, we have a military designed to stop a large tank advance from the Soviet Union, one that's not coming. One of Rummsfeld's thrusts was to lighten the US military and make it more nimble - lighter forces, special ops trained and stationed at home. All of that sounds right on to me given our current and future threats. Generals being old men trust what they know and are experts at fighting the last war, thus our current deployment of expensive hardware and 200k troops in
JMO
OTB