 His first postwar assignment came in February 1946 when he was assigned to Joint Task Force One, the organization which conducted "Operation Crossroads", the atomic bomb tests at Bikini Atoll.Later under the CNO, as head of the Defense and Protection Section, he established the U.S. Navy Radiological Safety School, and aided in setting up a comparable school for the Army.From October to December 1947, he was assigned to the carrier and was aboard her during her round-the-world cruise in 1948.