Olympics

LONDON, ENGLAND - MAY 04: The Royal Navy Helicopter Carrier HMS Ocean moored on the River Thames at Greenwich as part of security rehearsals ahead of the London 2012 Olympics, on May 4, 2012 in London, England. The exercise is aimed at testing military capabilities to ensure operational readiness before the start of the Olympic Games. (Photo by Adam Jacobs/Getty Images)

LONDON, ENGLAND - MAY 04: The Royal Navy Helicopter Carrier HMS Ocean moored on the River Thames at Greenwich as part of security rehearsals ahead of the London 2012 Olympics, on May 4, 2012 in London, England. The exercise is aimed at testing military capabilities to ensure operational readiness before the start of the Olympic Games. (Photo by Adam Jacobs/Getty Images)