Instructions: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Input: Passage: A.F.K. Organski was born in Rome, Italy. As a youth, he attended the Ginnasio Liceo Torquato Tasso. He went to the United States fleeing the anti-Jewish laws of the Benito Mussolini regime and later served with the American armed forces in the Pacific theater from 1943 to 1945. After World War II, he settled in New York City, where he became an American citizen in 1944 and earned his B.A. (1947), M.A. (1948), and Ph.D. (1951) degrees from New York University. In 1952 he started teaching at the Brooklyn College, moving in 1964 to the University of Michigan, where he became professor of political science and senior research scientist in the Institute for Social Research. He co-founded Decision Insights, a consulting firm focused on introducing scientific rigor to the execution of policy and decision making in government and business.
 Link Information: World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945. Answer: 4
Output:
How long had World War II been going on for when Organski started serving with the American armed forces?