Decal - 3 Inches Wide
A victory marking (also called a victory mark, kill marking, or kill mark) is a symbol applied in stencil or decal to the side of a military aircraft to denote an aerial victory achieved by the aircraft's pilot or crew. The use of victory markings originated during World War I, and frequently took the form of the roundel or national flag of the nationality of the aircraft or vehicle defeated.
Naval Ensign of the Empire of Japan Victory Markings Decal from the Sierra Hotel Aeronautics Pilot Shop & Pilot Supply Co.
U-Boat Victory Markings