Speaking of Leadership: How America Lost Its Four Great Generals

Is there a leadership vacuum created by the recent departures of four 4-star generals?  No question, in my mind.  This article provides a good recap of their accomplishments and the vacuum created by their leave.

... it is hard to imagine the Civil War having been won without Grant, Sherman, and Sheridan—or World War II without Marshall, Eisenhower, Patton, Bradley, Arnold, LeMay, Nimitz, Halsey, and all the other senior generals and admirals...it is hard to imagine the War on Terror having been waged without four-star commanders such as David Petraeus, Stanley McChrystal, John Allen, and James Mattis. They are among the most illustrious generals produced by the last decade of fighting. They are the stars of their generation.

Now, they are gone.