When the Chapel-on-the-Hill was completed that same month, the United Church and the local Roman Catholic Church were given control of the building, as the only two churches then officially operating in the Manhattan Project community. During the war, when Oak Ridge's Manhattan Project facilities were operating around the clock, the chapel building was also in use nearly 24 hours a day as a venue for worship services, weddings, and other occasions for local workers of various Protestant, Catholic, and Jewish religious backgrounds.