Olympic security in air, sea and land

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Security forces take part in a combined British police and British Royal Marines security exercise for the London 2012 Olympic Games on the River Thames in London on Jan. 19, 2012.

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Security guards man a barrier closing The Mall in central London on June 27, 2012, as work is carried out on two Olympic venues in Horse Guards Parade and the Mall in London.

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Security work at the entrance adjacent to the Westfield Mall, Stratford, at the Olympic Park on July 14, 2012, in London. The overall 23,700-strong security force will include a mix of military, private security guards and at least 3,000 unpaid volunteers.

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Military personnel walk away from the Olympic Stadium at the 2012 Olympic Parc on July 14, 2012, in London. Britain's military is to provide up to 3,500 extra troops for security duty at the Olympic Games, amid fears that the private firm G4S will not be able to supply enough personnel.

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A cameraman films a high-velocity missile, or HVM, lightweight multiple launcher during a media event May 3, 2012, in Blackheath, London, ahead of a training exercise designed to test military procedures for the Olympics.

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David McIntosh, a former British Royal marine, currently employed by the Protection Services International company, travels on London's River Thames on July 4, 2012. Companies like Protection Services International are just one of the many catering to the super rich who are coming to the London games and demand top security and easy transport.

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An aerial view on July 13, 2012, of a British military missile battery on Blackheath common in south London, which is part of the defenses for the London 2012 Olympic summer games.

An aerial view on July, 13, 2012, of a British military missile battery placed on top of the Fred Wigg building in east London, part of the defenses for the London 2012 Olympic summer games.

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Snipers with the Royal Air Force Regiment, look through the scopes of their sniper rifles at RAF Northolt in London, July 13, 2012,as the military prepares for duty to provide security aboard helicopters high above the London Olympic games. Aircraft that fail to comply with procedures within a restricted airspace zone around the Olympic venues could be subject to "lethal force" from the military.

A sniper with Royal Air Force Regiment Sniper sights through his scope from inside an RAF Puma helicopter at RAF Northolt ahead of carrying out air security duties for Op Olympic, in London, July 13, 2012.

In this photo issued by Britain's Ministry of Defence, 150 sailors and aircrew mark the start of the ship's Olympic deployment as it arrives July 13, 2012, at Greenwich on the River Thames in London, where it will serve as a helicopter landing platform and logistics hub. The 21,500-ton helicopter carrier will also be home for 400 military personnel providing security in Greenwich Park, where the equestrian events and modern pentathlon will take place.

Two soldiers walk past the Olympic stadium in the Olympic Park on July 13, 2012 in London. An extra 3500 soldiers are to be deployed to guard at the London 2012 Olympics.

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An unidentified person is searched by British military personnel at a security checkpoint on arrival at the Olympic Park for the 2012 Summer Olympics, July 16, 2012, in London.

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An army vehicle is seen outside Tobacco Dock, in Wapping, east London, July 16, 2012. A total of 3,500 troops, many of whom will be billeted at Tobacco Dock, were brought in to boost the number of servicemen and women involved in Games security.

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Metropolitan specialist dog Chester sniffs luggage at Victoria Coach Station on July 12, 2012, in London. Security is being stepped up across the capital ahead of the London 2012 Olympics.

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British Defense Secretary Phillip Hammond,left, talks with Captain Andrew Betton on board British Royal Navy helicopter carrier HMS Ocean as the ship heads towards Greenwich, London for a security exercise in preparation for the London 2012 Olympic Games on May 4, 2012. HMS Ocean, Britain's largest ship, will be stationed at Greenwich in east London for the duration of the Games as a maritime logistics hub and helicopter launch pad.

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A boat drifts near The HMS Ocean on July 15, 2012, in London. The carrier HMS Ocean, the Royal Navy's largest ship, is moored on the River Thames outside Greenwich where it will stay during the 2012 Olympic games.

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Members of the Armed Forces are shown around the site of the London 2012 Olympics on July 15, 2012. Following the failure of contracted security firm G4S to provide the 10,000 trained security for the events, the Armed Forces have been drafted in to assist with security operations.

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A woman directs people to the Olympic Park site in Westfield shopping centre on July 17, 2012, in London. A failure by the security firm G4S to provide their contracted number of security staff to guard Olympic venues has resulted in 3,500 extra troops and additional police officers being deployed to meet the shortfall.

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Soldier Security checks at the Main Entrance adjacent to Westfield Stratford City Mall at the Olympic Park on July 17, 2012, in London.