Historic Naval Ships Association - Submarine War Patrol Reports. At the end of each war patrol of WW II, submarine commanders created a report on the patrol.
These reports were used as the raw material to inform intelligence, improve tactics, evaluate commanders, etc. During WW II, over 1,550 patrol reports containing approximately 63,000 pages were generated. During the 1970s these were photographed and reproduced on microfilm to make them more easly accessible and easily reproduced (approx. 250 rolls). Naval History and Heritage Command. U.S. Submarine War Patrol Report - WWII Archives. Naval History Magazine.