The last surviving member of the US air crew that dropped an atomic bomb on Hiroshima has died in Stone Mountain, Georgia aged 93.Theodore Van Kirk, also known as “Dutch”, was 24 when he became the navigator of the Enola Gay, the aircraft which dropped the atom bomb. The attack on Japan on 6 August 1945 killed an estimated 140,000 people. Dutch said he had “no regrets” about the mission and defended its morality, saying it helped to end the Second World War. His son, Tom Van Kirk, paid tribute to his father, who he said remained active until the end of his life. “I know he was recognized as a war hero, but we just knew him as a great father”, he told AP.