This is not a book for the casual reader on the subject. That honor should go to Richard Rhodes' work Masters of Death: The SS Einsatzgruppen and the Invention of the Holocaust. Richard used information from The Field Men for his own work and graciously said of it:
"…One of the few sources of reliable information about the Einsatzgruppen…"
The Field Men presents the nuts and bolts of how the Einsatzkommandos operated: their organization, equipment, weapons, methods of killing, German Army assistance, German Police assistance, erasing the crimes and the heart of the book – biographical information on 380 SS officers, who were assigned to operate these terrible organizations. After the biographical information is presented, the book devotes 20 pages to analyze these officers with respect to awards received, later assignments, ethnicity, age and other career factors. The microfilm file number for each officer is provided (They use the book at the National Archives at College Park, Maryland), as is an appendix that provides a translation of German to English to assist a researcher look through theses personnel records at the archives.
If you are a dedicated Holocaust historian, and if your copy of the paperback edition of Raul Hilberg's The Destruction of the European Jews is as "dog-eared" as mine is, this is a definite book for your library.