No thanks, no war has EVER been won based upon a solely defensive posture.
Frankly I would research history and adapt modern day technology based upon how Genghis Khan invaded Europe.
Even the Nazi invasion of Poland has very good blitzkrieg strategies.
There was never a Nazi Party invasion of Poland, perhaps you mean the German invasion?
No one is trying to take over another country. Unless you count the obamists. When it starts would you rather be in your suburb on in a home that sits on 1 acre, or a massive subdivision of like minded people with area to out manuveur your attackers, and to drill for it on occassion.