During the First World War, the church obtained exemption from military service in Britain under the name "The Testimony of Jesus". However, there were problems with recognition of this name outside the British Isles, and exemption was refused in many other areas. In New Zealand during World War I, members of the church could not prove their conscientious objector status, and formed the largest segment of those imprisoned for refusal to serve. Members and ministers also had difficulty establishing their conscientious objector status in the United States during the First World War. With the start of the Second World War, formal names were adopted and used in registering the church with various national governments. These names continued to be used for official business, and stationery bearing those names was printed for the use of overseers. Most members were not aware of these names. Some who dissented after learning of the practice were expelled by the workers.