After her brother was drafted, Jo-Ellen Iacovino and her family moved to Happy Valley, Tennessee to support the war effort. Although Iacovino and her sister, Sheila Rowan, were too young to participate in the construction of the K-25, gaseous diffusion plant, their older sister, Colleen Black, and their parents worked to support the Manhattan Project. When the war ended, Iacovino left Happy Valley.