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Commander of NATO troops in Afghanistan, US General David Petraeus, salutes during a change of command ceremony at ISAF headquarters in Kabul on July 18, 2011.

Former CIA Director David Petraeus is scheduled to testify tomorrow about the diplomatic mission in Benghazi before the Senate Intelligence Committee. This will be his first public appearance since the scandal broke. 

The military has specific protocol that it follows when it comes to the personal lives of its high-ranking officials. Here to explain how the military law works when it comes to adultery and scandal is Eugene Fidell, a military law expert at Yale University.