The Armed Forces are expected to play a key role in the Queen's state funeral.
Her Majesty who reigned for seven decades died "peacefully" on Thursday afternoon at Balmoral Castle in Aberdeenshire, Buckingham Palace said.
Here's a look at the funeral and what involvement the military is set to have.
The Queen's state funeral is expected to take place at Westminster Abbey in central London on Monday 19 September.
The original plans are for the Queen's coffin to process on a gun carriage to the abbey, pulled by naval ratings – sailors – using ropes rather than horses.
Watch: Emotional members of the public pay tribute to the Queen at Holyrood Palace.
Senior members of the family are expected to poignantly follow behind – just like they did for the funeral of Diana, Princess of Wales and the Duke of Edinburgh.
The military will line the streets and also join the procession.
Former head of the British Army, Lord Dannatt, said the Armed Forces will be ready for their duties.
"The plans have been made over many weeks and months and years, and will now be going into the implementation phase," he told Forces News.
"People know what they have got to do, now they know when they've got to do it."
Heads of state, prime ministers and presidents, European royals and key figures from public life will be invited to gather in the abbey, which can hold a congregation of 2,000.
Watch: Ex-Army chief says military personnel will be prepared for Queen's funeral.
The service will be televised, and a national two minutes' silence is expected to be held.
On the day of the funeral, the Queen's coffin will be taken to St George's Chapel at Windsor Castle for a televised committal service.
Later in the evening, there will be a private interment service with senior members of the Royal Family.
The Queen's final resting place will be the King George VI memorial chapel, an annexe to the main chapel – where her mother and father were buried, along with the ashes of her sister, Princess Margaret.
Prince Philip's coffin will move from the Royal Vault to the memorial chapel to join the Queen's.