This discussion probably would be more appropriate in "Proceedings", but I'm going to disagree with J because I enjoy this debate.
In my opinion, "conventional warfare is dead. The days of our army starts here their army starts there one big fight or campaign and the winner takes all has gone the way of the Dodo bird .
War between major countries will be either economic, Nuclear, I'll grant J the Cyber/Space war as part of what I had in mind when I mentioned a "Nuke swap". Those types of fighting will take place over an incredibly short time, and considering the dependance we place on computer control systems the winner could be slapped back to the 1800's while the losers entire social structure would simply cease to exist.
That would be war with a top tier society like Russia, China, India, Japan, S Korea.
Against any one at a lower level of development Iraq serves as a crystal ball.
Lets look at what actually happened there.
We launched a conventional invasion aimed at destroying the Iraqi military forces and ending the war.
Our 3 divisions and air power dominated the nation, blowing through Iraqi defenses like sh!t through a chicken.
Meanwhile anti western jihadis of every variety flocked to Iraq to repel the evil crusader invaders.
Did they flock to Saddam's forces where they would have access to artillery and all kinds of neat toys the Russians were shipping in ?
They did not, they did the same thing the dedicated Saddam supporters did. They blended in with the population and adopted classic guerrilla tactics, snipers, ambushes, bombings.
They avoided our strength in conventional combat power.
Instead they attacked the weakness of American public opinion. A constant trickle of casualties and a massive propaganda effort launched at the American media, while undermining our attempts at nation building by playing on local and regional fears, and animosities we barely understood using assassinations and terror.
The Jihadi's learned the lesson of Vietnam, if you can avoid destruction long enough the Americans will get fed up and leave.
That is the face of Future war.
No matter what we may plan, our foes will disappear into the woodwork and apply the tactics that work.
America is no longer the "Greatest Generation", they are now a bunch of pussies who will not accept the casualties required to actually win.
If you think I'm wrong I challenge you to consider the 1st Gulf War's, "Highway of death" and the fact that air attacks were discontinued due to a fear that such massive casualties even by the enemy would end support for the war.
That is the face of "Future war".
Regardless of our best laid plans, our foes will put up token resistance then fade into the woodwork to apply the tactics that have been proven to work.
As for China, they are no military threat to us unless we pay off our debt to them.
Thir own economy is to dependent on us for them to risk their own recession regardless of their capabilities.