Updated

The no-fly zone has shrunk and the missiles have been put to bed, but security around London's upcoming Paralympic Games will still be tight.

Britain's defense ministry said about 3,500 military personnel will be available for venue security duties, if needed, compared with 12,200 during the Summer Olympics.

Fighter jets put on standby to intercept threats during the Olympics have returned to normal duties, but the HMS Ocean — the largest ship in the Royal Navy's fleet — will remain berthed in south London to act as a helicopter landing site and logistics base.

The London organizing committee's chief executive, Paul Deighton, said Tuesday that G4S will provide security at the venues, using up to 5,000 workers.