About the Book The United States Army Ground Forces During the Interwar Years 1919-1941 covers the period of the Interwar years 1919-1941. It is intended for individuals interested in US Army history of that era. Insignias and pictures lend to the experience of the era. About the Author MSG Jim Irwin (Retired) is a retired community college professor. He taught business and technology courses. He served two years in the US Army during the Vietnam war, and spent another twenty-seven years in the Indiana Army National Guard. His biggest hobby is reading fiction and non-fiction alike.