Orange triangle with black border
1939-1940 in the Netherlands
1939-1942 in the Dutch East Indies
1939-1945 in the Dutch West Indies
Between 1940 and 1945, certain RAF and Royal Navy aircraft flew with a small orange triangle under the cockpit window.
The red, white, blue, orange roundel was replaced in 1939 because it looked too much like the roundel of the RAF and the Netherlands did not want to risk a conflict with the Luftwaffe or the Japanese air force.