Commander in Chief - The Honorable Barack H. Obama Secretary Of Defense - The Honorable Robert Gates Secretary of the Navy - The Honorable Ray Mabus Chief of Naval Operations - Admiral Gary Roughead...
See this page for links to pdf's on how the U.S. government is organized and the divisions of power within various branches: http://bensguide.gpo.gov/9-12/government/branches.html
The US Govt. does not have a "Chain of Command" because it is not a military structure. It's actually called the "Order of Succession", a government term, and is commonly confused with the Military...
The US military chain of command for all services starts with the President of the United States, as the Commander and Chief. After the President there are thousands of permutations of the Chain of...