Fx-109 (Japan): Anti-Submarine Aircraft
A Japanese prototype anti-submarine aircraft designed in the late 1940s, equipped for hunting submarines, but never entered production due to the end of World War II.
Dirigible Warfare
The use of dirigibles in military operations, including reconnaissance, bombing, transport, and anti-submarine warfare.
Br-21: British Supermarine Walrus Amphibian
A British amphibious aircraft that served with the Royal Navy and Royal Air Force during World War II. It was used for reconnaissance, anti-submarine patrol, and rescue operations.