Richard Sankey, an OA Trustee, attended the Remembrance Sunday service in central London.
The Prince of Wales laid a poppy wreath on behalf of the Queen, who watched for the first time from a Foreign Office balcony. She was joined by the Duke of Edinburgh and the Duchess of Cornwall. The Duke of Cambridge and Prince Harry also attended, alongside other members of the Royal Family.
Across the UK a two-minute silence was held, and poppy wreaths were laid at war memorials to remember those who died in conflict.
It is the centenary of the Battle of Passchendaele, where approximately a third of a million British and Allied soldiers were killed or wounded, including many officers. Those who survived World War One often struggled to find financial support, healthcare, housing and employment. The OA was founded to help demobilised officers rebuild their lives.
Richard Sankey, a former officer in the 9th/12th Royal Lancers, said: “I was honoured to represent the OA at the Cenotaph. Since 1914, thousands of British officers have died in conflicts around the world. Even today, they are fulfilling dangerous roles to make the world safer.”