You really think an enemy is going to follow the War Game "directions"?
It's mostly about coordinating movements with other country's military hierarchies.
Given that Obama ousted just about any high-ranking officer of any worth from any branch of our services, I'd say that we need the practice more than anybody else given that we've had some recent high-profile crashes over there.
-PJ
Military presence is a zero sum game. And it’s much harder to reestablish than to just continue. If we aren’t there, China will be.
Change over in personnel from promotions, people leaving, or new recruits means that every few years or so you are looking at an entirely new armed force. While it seems simple getting troops point A to point B. It's a logistical and bureaucratic nightmare. By having war games every so often you make sure the Army has people with experience to accomplish the task. You also make sure that policy and procedures are honed and any oversights in the process are fixed. You also make sure that knowledge trickles up the chain of command as people from this year's war game get promoted.