There's a great discussion on leadership going on over on Soldier Systems.
Here's an excerpt:
"I divide my officers into four groups. There are clever, diligent, stupid, and lazy officers. Usually two characteristics are combined. Some are clever and diligent — their place is the General Staff. The next lot are stupid and lazy — they make up 90 percent of every army and are suited to routine duties. Anyone who is both clever and lazy is qualified for the highest leadership duties, because he possesses the intellectual clarity and the composure necessary for difficult decisions. One must beware of anyone who is stupid and diligent — he must not be entrusted with any responsibility because he will always cause only mischief."
Remember, in the German model, the most promising go to the General Staff for grooming. In the American model, the best and brightest take command. Considering that, do you think its still a viable model?