A page from Lt. Wayne E. Bancroft's official U.S. Navy flight logbook, January 1951. The entries document flights in the PBM-5 Mariner, a twin-engine patrol flying boat used for maritime reconnaissance and anti-submarine patrol during the Korean War era. Meticulously kept logbooks like this one formed the official record of a naval aviator's flight experience, hours, and qualifications throughout his career. Project: 218133