Which is why George Osborne was very keen to recruit the governor of the Bank of Canada, Mark Carney, to succeed Sir Mervyn King in a rather bigger and more complex job, as governor of the Bank of England.
Retired commanders and defense analysts generally laud Petraeus as a leader and strategist, but they warn that he'll have far bigger and more complex responsibilities in the new job, which he takes over on Sept. 16.