<Ul> <Li> Grenadier Guards </Li> <Li> Coldstream Guards </Li> <Li> Scots Guards </Li> <Li> Irish Guards </Li> <Li> Welsh Guards </Li> </Ul> <P> Each unit mans the guard for a total of six hours, with each detachment standing post for twenty minutes . The four men stand at each corner with heads bowed and weapons inverted; their backs are turned towards the coffin . </P> <P> On two occasions, the guard has been mounted by four male members of the Royal Family . At the lying in state of King George V in 1936, the guard was mounted by his four sons King Edward VIII, the Duke of York (George VI), the Duke of Gloucester and the Duke of Kent . For Queen Elizabeth The Queen Mother's lying - in - state in 2002, the guard was mounted by her four grandsons, the Prince of Wales, the Duke of York, the Earl of Wessex, and Viscount Linley . </P> <P> Lying in state is the rare honor granted by the United States to a deceased official whereby his or her remains are placed in the rotunda of the United States Capitol in Washington, D.C., for public viewing . The casket is guarded by members of the armed forces . By regulation and custom, only Presidents, military commanders, and members of Congress are granted the honor of lying in state . Except for Presidents and former Presidents, the honor is not automatic . Not all those entitled to the honor have it accepted by their survivors . The first leader to receive this honor was Henry Clay, former Speaker of the House of Representatives, when he died in 1852 . Since then, the honor has been extended to 29 people, including eleven Presidents . </P>

Who are the civilians who have laid in state at the us capitol