FILE - In this June 8, 1982 file photo, U.S. President Ronald Reagan, on Centennial, and Britain's Queen Elizabeth II, on Burmese, go horseback riding on the grounds of Windsor Castle, England. Starting Saturday, June 2, 2012, Queen Elizabeth II begins a four-day celebration of her 60 years on the throne. (AP Photo/Bob Daugherty, File)

Use Information This content is intended for editorial use only.
For other uses, additional clearances may be required.