The military will provide an extra 3,500 troops for security during the Olympics, to make up for a short-fall in private security guards.
A video posted online apparently shows military equipment, being used as part of Olympics security, left unguarded outside London flats.
The appearance of fighter jets in the skies over London will mark the start of an extraordinary Olympic test event.
Service personnel from the Royal Navy, Army and Royal Air Force have today been announced as the flag bearers for the Team Welcome and Victory Ceremonies at the London 2012 Olympic and Paralympic Games.
Dressed in their Ceremonial Day uniforms, 176 service men and women will take part in 100 Team Welcome Ceremonies and 805 Victory Ceremonies during the Games.
The personnel have been chosen through a Ministry of Defence (MOD) nomination process, highlighting those with sporting or operational achievements, or who are involved in their local community.