sentences:  In the Second World War, he initially registered as a conscientious objector, but when Nazi Germany invaded the USSR in 1941, he withdrew his objection.He was called up to the Royal Air Force and worked in air-sea rescue, serving for a time the Cocos Islands in the Indian Ocean, where he was inspired by the large crabs.He returned to Moore's studio after the war, and helped Moore with his marble sculpture "Three Standing Figures 1947" and his 1949 bronze "Family Group".