High Quality Content by WIKIPEDIA articles! The Swoose is a Boeing B-17 Flying Fortress D-BO, USAAF 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. It is also the only existing B-17 to have seen action in the 1941-42 Philippines Campaign, the first day of the United States entry into the war. A recent controversy on how best to restore and display the aircraft has caused the National Museum of the United States Air Force to suspend restoration of the aircraft.