Regina Benjamin is not in the military, and, as far as I can tell, never was. As the Surgeon General of the United States, she falls under the United States Public Health Service Commissioned Corps, which is a uniformed service of the United States, but is not a military service. However, the Commissioned Corps uses a rank structure taken from the Navy, and she holds the rank of Vice Admiral in the USPHSCC.

Andrew Jackson held the highest military rank of Major General in the United States Army.

In the United States military, the rank before captain is first lieutenant.

There is a full list of military schools available online. You can go to www.militaryschools.com to find this list.

As President of the United States, Barack Obama's military rank -is- Commander-In-Chief.

Obama never served in the military. He was 11-years old when, on January 27, 1973, the then-Secretary of Defense Melvin Laird announced the creation of the all-volunteer armed forces which ended the United States military draft.