In 1939, the D'Oyly Carte briefly disbanded due to the outbreak of World War II. Green continued acting with other companies and then joined the Royal Air Force, in which he served as an instructor and administrator from 1941 to 1945.
In 1939, the D'Oyly Carte briefly disbanded due to the outbreak of World War II. Green continued acting with other companies, including Charles B. Cochran's for the revue "Lights Up" at the Savoy Theatre. He then joined the Royal Air Force, serving as an instructor and administrator from 1941 to 1945.