The Swoose is a B-17D-BO Flying Fortress, USAAF Ser. No. "40-3097", that saw extensive use in the Southwest Pacific theatre of World War II and survived to become the oldest B-17 still intact. It is the only early "shark fin" B-17 known to exist, and the only surviving B-17 to have seen action in the 1941–42 Philippines Campaign, operating on the first day of the United States entry into the war.