After returning to the U.S., Mills reported immediately to CCF headquarter in Richmond, Virginia. For the next few months, he traveled extensively to Japan and Korea, establishing orphanges under CCF in both countries.      In December 1950, North Korean forces had invaded South Korea and the safety of the orphanages were threatened. Mills, aided by American fighter pilot Colonel Dean Hess of the Fifth Air Force and other GIs, personally supervised the air evacuation of over a thousand orphan children to Cheju Island, about 60 miles off the south coast of Korea. In this barren island, there was no building structure to shield the children from the frigid winter chill. Some children actually died from hypothermia. Using their entrenching tools, the GIs dug foxholes on the mountainside, each one big enough for one child. At night, the little ones would slide into the foxholes, and cover themselves with a piece of cardboard torn from the U.S. Army C-ration. They subsisted on limited food and drinking water until it was safe for them to return to the mainland. The rescue came to be known as Operation Kiddie-Car and provided the story for a movie entitled Battle Hymn.      By 1951, CCF had a significant presence in both countries, assisting some 4,000 children in 23 orphanages in Korea and over 6,000 children in 60 orphanages in Japan, many of whom were abandoned, illegitimate children of the American soldiers. Impressed by his work, the Japanese government asked CCF to establish a college to train social workers. The result was Izumi Junior College, Japan's very first professional school of social work which was built right next door to CCF's orphanage, the Bott Memorial Home. To this day, the college continues to provide professional training to social workers specializing in child welfare.      Because so much work had been done in Japan and Korea, and projects were started in other Asian countries as well, the time had come that the name China's Children Fund was no longer appropriate. On Feb. 6, 1951, the CCF's board of directors , while retaining the abbreviation: CCF, changed the name to Christian Children's Fund, Inc. Shortly after, Mills was asked to become the Overseas Director responsible for operations worldwide. With his new role, the Millses moved back to Hong Kong in Fall, 1951. Once again, he lived among the Chinese whom he had grown to love.