Passage: On G. I. Taylor's advice and recommendation, Dyson moved to the United States in 1947 as a Commonwealth Fellow to earn a physics doctorate with Hans Bethe at Cornell University (1947–48). There he made the acquaintance of Richard Feynman. The budding English physicist recognized the brilliance of the flamboyant American, and attached himself as quickly as possible. He then moved to the Institute for Advanced Study (1948–49), before returning to England (1949–51), where he was a research fellow at the University of Birmingham.In 1949 Dyson demonstrated the equivalence of two formulations of quantum electrodynamics (QED): Richard Feynman's diagrams and the operator method developed by Julian Schwinger and Shin'ichirō Tomonaga. He was the first person after their creator to appreciate the power of Feynman diagrams and his paper written in 1948 and published in 1949 was the first to make use of them. He said in that paper that Feynman diagrams were not just a computational tool but a physical theory and developed rules for the diagrams that completely solved the renormalization problem. Dyson's paper and also his lectures presented Feynman's theories of QED in a form that other physicists could understand, facilitating the physics community's acceptance of Feynman's work. J. Robert Oppenheimer, in particular, was persuaded by Dyson that Feynman's new theory was as valid as Schwinger's and Tomonaga's. Oppenheimer rewarded Dyson with a lifetime appointment at the Institute for Advanced Study, "for proving me wrong", in Oppenheimer's words.Also in 1949, in related work, Dyson invented the Dyson series. It was this paper that inspired John Ward to derive his celebrated Ward–Takahashi identity.In 1951 Dyson joined the faculty at Cornell as a physics professor, though he still had no doctorate, and in 1953 he received a permanent post at the Institute for Advanced Study in Princeton, New Jersey, where he has remained. In 1957 he became a naturalized citizen of the United States and renounced his British nationality....

Question: What was the name of the project in which Dyson worked on?
Project Orion