There will be no peace. At any given moment for the rest of our lifetimes, there will be multiple conflicts in mutating forms around the globe. Violent conflict will dominate the headlines, but cultural and economic struggles will be steadier and ultimately more decisive. The de facto role of the US armed forces will be to keep the world safe for our economy and open to our cultural assault. To those ends, we will do a fair amount of killing.
We are building an information-based military to do that killing. There will still be plenty of muscle power required, but much of our military art will consist in knowing more about the enemy than he knows about himself, manipulating data for effectiveness and efficiency, and denying similar advantages to our opponents. This will involve a good bit of technology, but the relevant systems will not be the budget vampires, such as manned bombers and attack submarines, that we continue to buy through inertia, emotional attachment, and the lobbying power of the defense industry. Our most important technologies will be those that support soldiers and Marines on the ground, that facilitate command decisions, and that enable us to kill accurately and survive amid clutter (such as multidimensional urban battlefields).
Source: Constant Conflict