Why Was John F. Kennedy Buried at Arlington National Cemetery?

It was not because he had been President of the United States. The only other President to be buried at Arlington was William Howard Taft, who died in 1930, and who had served as President and as Chief Justice of the United States. No President since Kennedy has been buried at Arlington. Kennedy is not the only President to have been assassinated, and he is not the only President to have served in the military during wartime. Except for Taft and Kennedy, every other deceased President is buried somewhere other than Arlington. So why was Kennedy buried at Arlington?