Army vs. Navy

From the TBD:

Should the Army be more like the Navy in holding its commanders accountable?

How do we explain the huge disparity between the large number of Navy Commanders getting fired (more than 30 in 2011) and the relatively small number of Army Commanders getting fired? 

There are a few common and unwritten themes on this topic:
1. A commander can delegate authority, but not responsibility. Authority refers to "who is in charge" while responsibility refers to "who is accountable."
2. A commander is responsible but very often not in control.
3. Commanders have a responsibility to ensure their subordinates are trained and can operate independently based on the commander's intent.
4. Commanders have a responsibility to set a command climate wherein subordinates will act ethically in the absence of leaders.