What is the theme in The Generals: Brotherhood of War 06 by W. E. B. Griffin?

Another recurring theme throughout the book are the relationships of some of the main characters, particularly Craig Lowell. Lowell's wife had been killed in an accident many years ago. He basically became known as a lady's man, even though his life was based on abstinence for many years. He and Dorothy Simms did not like one another when they first met, but that quickly changed, and they soon became lovers.