You need to read "The Sling and the Stone." It's by retired Marine Colonel T.X. Hammes. TX did two tours in Iraq and led one of the inital drives into Bagdhad. I had the pleasure of having dinner with him recently, and will be having dinner this Sunday with him and several other warriors. It's always a great conversation, especially since active duty and recent active duty Seals, Naval aviation, Navy medicine, and Marines are in the mix.
TX argues that we are fighting a fourth generation war (insurgency) with third generation tactics. He made this argument in front of Congress recently and got a big "Duh?" from them. They didn't want to hear it.
Read his book. It's well worth the few dollars.