During 1943 and 1944, the Metallurgical Laboratory focused on first getting the X-10 Graphite Reactor at the Clinton Engineer Works up and running, and then the B Reactor at the Hanford Site. By the end of 1944, the focus had switched to training operators. Much of the chemistry division moved to Oak Ridge in October 1943, and many personnel were transferred to other Manhattan Project sites in 1944, particularly Hanford and Los Alamos. Fermi became a division head at Los Alamos in September 1944, and Zinn became the director of the Argonne Laboratory. Allison followed in November 1944, taking with him many of the Metallurgical Laboratory's staff, including most of the instrument section. He was replaced by Joyce C. Stearns. Farrington Daniels, who became associate director on 1 September 1944, succeeded Stearns as director on 1 July 1945.