values must outweigh military claims as governments determine their priorities; that the militarization of society must be challenged and stopped; that the manufacture, sale, and deployment of armaments must be reduced and controlled; and that the production, possession, or use of nuclear weapons be condemned. Consequently, the United Methodist Church endorses general and complete disarmament under strict and effective international control. The United Methodist Church, like many Mainline Protestant denominations in the U.S., has a long tradition of providing ordained military chaplains who serve in all branches of the U.S. Armed Forces. Pornography The United Methodist Church teaches that pornography is "about violence, degradation, exploitation, and coercion" and "deplore[s] all forms of commercialization, abuse, and exploitation of sex." The Sexual Ethics Task Force of The United Methodist Church states that "Research shows it [pornography] is not an 'innocent activity.' It is harmful and is generally addictive. Persons who are addicted to pornography are physiologically altered, as is their perspective, relationships with parishioners and family, and their perceptions of girls and women." Stem cell research The UMC supports federal funding for research on embryos created for in vitro fertilization that remain after the procreative efforts have ceased, if the embryos were provided for research instead of being destroyed, were not obtained by sale, and those donating had given prior informed consent for the research purposes. The UMC stands in "opposition to the creation of embryos for the sake of research" as "a human embryo, even at its earliest stages, commands our reverence." It supports research on stem cells retrieved from umbilical cords and adult stem cells, stating that there are "few moral questions" raised by this issue. Worship and liturgy The United Methodist Church includes a variety of approaches to public worship. The common pattern of worship is found in the official liturgies of the church, while the practices of congregations across the denomination are quite diverse. The common pattern comes from John Wesley, who wrote that "there is no Liturgy in the world, either in ancient or modern language, which breathes more of a solid, scriptural, rational piety, than the Common Prayer of the Church of England." When the Methodists in America were separated from the Church of England, John Wesley himself provided a revised version of The Book of Common Prayer called The Sunday Service of the Methodists; With Other Occasional Services. Wesley's Sunday Service has shaped the official