Dwight Jon Zimmerman

DWIGHT JON ZIMMERMAN has written extensively on military-history subjects for "American Heritage," the "Naval Institute Press," "Vietnam Magazine," and numerous military-themed publications. He lives in Brooklyn, New York. JOHN D. GRESHAM is a veteran military analyst and co-author with Tom Clancy on his bestselling series of nonfiction "guided tour" books about military units, including Special Forces and Marines. He lives in Virginia.