<P> The forward or tactical HQs (known as' tac' for short) is a small group of staff and communicators . Usually very mobile, they exist to allow the commander to go forward in an operation, and command the key parts of it from a position where they can see the ground and influence their immediate subordinates . </P> <P> The main HQs (known as' main') is less mobile and is involved in both the planning and execution of operations . There are a number of staff assembled here from various staff branches to advise the commander, and to control the various aspects of planning and the conduct of discrete operations . A main HQ for a large formation will have a chief of staff (CoS) who coordinates the staff effort; in a smaller HQ this may be done by the second - in - command . </P> <P> The rear or logistic HQs (' rear') is some distance from the battle or front line in conventional operations . Its function is to ensure the logistical support to front line troops, which it does by organizing the delivery of combat supplies, materiel and equipment to where they are needed, and by organizing services such as combat medicine, equipment recovery, and repair . </P> <P> The headquarters of the Catholic Church is Vatican City . The World Headquarters of Jehovah's Witnesses is relocated in Warwick, New York, from its former location, Brooklyn, New York . The headquarters of the Russian Orthodox Church is in Danilov Monastery, Moscow . The World Council of Churches, including Orthodox Churches, has its headquarters in Geneva, Switzerland . The headquarters of Ecumenical Patriarch of Constantinople is located in Istanbul, Turkey . The headquarters of The Church of Jesus Christ of Latter - day Saints is located in Salt Lake City, Utah . The Anglican Communion Office is in London . </P>

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