When I was 18, I got a summer job out at one of the AEC plants (Atomic Energy Commission now Dept. of Energy). There were 3 plants built by the government in the secret town of Oak Ridge, Tennessee, during World War II. One plant was K-25 (the Army used number designations) also called the Gaseous Diffusion Plant. The second plant was an auxiliary plant that did work for the other two called Y-12. My father worked there when I was growing up. The third plant was X-10, The Oak Ridge National Laboratory, where I worked for 3 summers after high school.