This helmet was worn during World War I by Lt. Milton K. Lockwood of the 50th Aero Squadron, who piloted DH-4 aircraft and survived three crash landings. The 50th Aero Squadron insignia is the Dutch Girl, the trademark emblem of Old Dutch Cleanser, which was adopted to represent that the squadron's focus was to “clean up on Germany” during WWI. (U.S. Air Force photo)