More than 70 officers from several forces who worked in the aftermath of the 7 July London bombings have received commendations.
Metropolitan Police Commissioner Sir Ian Blair honoured the unsung heroes including members of search teams and staff from the Met's video laboratory.
The 2005 bombings killed 52 people and injured nearly 800 others.
Members of Greater Manchester Police, Hampshire and Cheshire Constabulary were also honoured on Friday.
Sir Ian Blair said: "I am proud of each and every one of our staff, from first responders to those whose work is essential further down the line.
"They have a tough job to do in difficult and often extreme circumstances and this ceremony is all about recognising that and saying thank you."
The team who spent nine days combing the number 30 bus in Tavistock Square was also commended.
The ceremony recognised the efforts of the video laboratory staff who visited and reviewed CCTV footage from 1,000 locations to find the bombers.
A Heathrow-based Qantas airline manager, Chris Black, was praised for his work in the aftermath of the Asian Tsunami.