In February 1945, Joe was sent to the Pacific War, and Goeppert Mayer decided to leave her children in New York and join Teller's group at the Los Alamos Laboratory.
En febreiro de 1945 Joseph foi recrutado para a guerra do Pacífico, e Goeppert-Mayer decidiu deixar os seus fillos en Nova York e unirse ó grupo de Teller no Laboratorio Nacional de Los Álamos.