Armed Forces Day celebrates and commemorates the past and continuing contributions of the Armed Forces and veteran communities.
It is a chance for Londoners to show their support for the men and women who make up the Armed Forces community: from serving troops to Service families, veterans and recruits.
At 12 noon veterans will march across Tower Bridge, with a cannon salute and fly past.
Between 12 noon and 3pm there will be live music and entertainment. Bring a picnic and listen to close harmony singers, Jazz, marching bands and more.
There will also be an opportunity to watch a real army field kitchen in action.
Children's activities include the opportunity to get close to real army vehicles and tackle a climbing wall.
Plus launch of Food for Heroes cookbook.