What is the author's style in Eisenhower: Soldier and President by Stephen E. Ambrose?

This author perspective allows the reader a brief look into the points in Eisenhower's life that shaped him into the man America would trust with their very freedom. Ambrose shows the depth of love that Eisenhower had for not just his country, but also his countrymen, including the sacrifices that he made in his own personal life for the country he loved so dearly. The great sense of duty he felt to every service man during the war; he never took lightly the sacrifice they or their families made in the name of freedom for every American.