The Military History of Glen Hacking Calder and the 509th Military Police Battalion, 1943-1945, is a compilation written by two historians. The first is a short biographical history of Glen's military service by his grandson, Tyler Matthew Ricks. The second is a longer chronological autobiographical military history of his personal military experiences and an account with his comrades as a member of the 509th Military Police Battalion written by Gen Hacking Calder.