What is the author's style in The Best and the Brightest by David Halberstam?

The book is written in the perspective of a factual and objective document, describing the facts as the author found them to be from the French colonial days until the Nixon administration. It is written in the third person with the author being the narrator. There is a great deal of research and interviews that went into the book as is obvious when reading the book. It is full of examinations of reports, meetings and conversations between various government entities.