the books about the german army of WWII command by far the most dollars
and typically have authors with resumes such as this;
I'm a West Point Class of 1980 graduate and a retired U.S. Army Officer with 28 years of active duty service in places like Kosovo, Iraq, Afghanistan, Germany, Cuba, and Uzbekistan. I served in a variety of Army units, such as armored cavalry, armor, and special operations forces, including Civil Affairs and Psychological Operations. My works include "Hell's Gate: The Battle of the Cherkassy Pocket January to February 1944" and "Victory Was Beyond Their Grasp: with the 272nd Volks-Grenadier Division from the Huertgen Forest to the Heart of the Reich," as well as several articles for military history magazines, such as World War Two and Armchair General. Am currently working on a book about the German relief of Kovel, March 1944