 He served in the Israel Defense Forces during the 1948 Arab-Israeli War, reaching the rank of Captain.In 1949, he was sent to France to manage the Youth Aliyah department in Europe and North Africa until 1952.Although originally dreamed of having been an engineer, Bejski completed his law degree at the Sorbonne in 1951, and was awarded a doctorate in law for a thesis on human rights in the Bible.