On a visit to Afghanistan, Prince Andrew and Defense Secretary Philip Hammond each laid a wreath at a memorial in Camp Bastion in front of soldiers gathered for the tribute.
"We are not just remembering the millions of people who gave their lives in the two world wars but all those who have since died in the service of our country," Hammond said.
In London, the queen was joined by her husband, Prince Philip, and her grandsons, Princes William and Harry, who also laid wreaths of red poppies at the Cenotaph. William's wife, Kate, the Duchess of Cambridge, watched from a nearby balcony.
The War Widows Association, wearing black coats and red scarves, headed a march down Whitehall to mark the loss of those departed. They were followed by a parade of around 10,000 veterans some in wheelchairs as well-wishers lining the streets cheered.
Politicians including Prime Minister David Cameron and his predecessors John Major, Tony Blair and Gordon Brown also attended the ceremony.
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Sylvia Hui can be reached at http://Twitter.com/sylviahui