A view of the gun salute at the Tower of London, a single round was fired followed by a single round a minute later to begin and end the National Minute Silence immediately before the funeral service of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in London, Britain, April 17, 2021. Cpl Ed Wright RAF/UK Ministry of Defence 2021/Handout via REUTERS

Members of The King's Troop Royal Horse Artillery fire a gun salute, as a single round was fired followed by a single round a minute later to begin and end the National Minute Silence immediately before the funeral service of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, at the Parade Ground, Woolwich Barracks in London, Britain, April 17, 2021. SAC Tom Cann RAF/UK Ministry of Defence 2021/Handout via REUTERS

A view of the gun salute at Gibraltar, a single round was fired followed by a single round a minute later to begin and end the National Minute Silence immediately before the funeral service of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Gibraltar, April 17, 2021. Cpl Connor Payne RAF/UK Ministry of Defence 2021/Handout via REUTERS

A view of the gun salute at The Tower of London before the funeral service of Britain's Prince Philip, in London, Britain April 17, 2021. Cpl Ed Wright RAF/UK MOD Crown Copyright 2021/Handout via REUTERS

Members of RAF line the route of the procession as members of the Rifles march past at Windsor Castle, ahead of the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Steve Parsons/Pool via REUTERS

Members of the RAF march on the day the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, near Windsor Castle in Windsor, Britain, April 17, 2021. Kirsty O'Connor/Pool via REUTERS

Members of the RAF march on the grounds of the Windsor Castle on the day of the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, at Windsor Castle in Windsor, Britain, April 17, 2021. Leon Neal/Pool via REUTERS

The RAF Wings and Field Marshal's Baton, belonging to Britain's Prince Philip gifted to his wife, Queen Elizabeth II in 1953, are placed on the altar in St George's Chapel, Windsor, ahead of his funeral, Britain April 16, 2021. Picture taken April 16, 2021. Steve Parsons/Pool via REUTERS

RAF Wings and Field Marshal's Baton, fited to him by the Queen in 1953 are sewn onto a cushion in St James's Palace following Britain's Prince Philip death, in London, Britain April 13, 2021. Picture taken April 13, 2021. The cushions displaying medals and decorations conferred on the Duke of Edinburgh by the United Kingdom and other countries across the world will be placed on the altar in St George's Chapel, in Windsor, ahead of his funeral on Saturday. Kirsty O'Connor/PA Wire/Pool via REUTERS

A view of the Duke of Edinburgh's RAF Wings sewn onto a cushion in St James's Palace following Britain's Prince Philip death, in London, Britain April 13, 2021. Picture taken April 13, 2021. Kirsty O'Connor/Pool via REUTERS

Members of Rapid Action Force (RAF) stand guard at a site where farmers have gathered to protest against farm laws at Ghaziabad, India, January 28, 2021. REUTERS/Danish Siddiqui

A temporary mortuary is seen in the grounds of a former RAF rehabilitation hospital, amid the coronavirus (COVID-19) outbreak, at Headley Court in Epsom, Britain, January 12, 2021. Picture taken with a drone. REUTERS/Natalie Thomas REFILE - CORRECTING DATE

A temporary mortuary is seen in the grounds of a former RAF rehabilitation hospital, amid the coronavirus (COVID-19) outbreak, at Headley Court in Epsom, Britain, January 12, 2021. Picture taken with a drone. REUTERS/Natalie Thomas REFILE - CORRECTING DATE

A temporary mortuary is seen in the grounds of a former RAF rehabilitation hospital, amid the coronavirus (COVID-19) outbreak, at Headley Court in Epsom, Britain, January 12, 2021. Picture taken with a drone. REUTERS/Natalie Thomas REFILE - CORRECTING DATE

A temporary mortuary is seen in the grounds of a former RAF rehabilitation hospital, amid the coronavirus (COVID-19) outbreak, at Headley Court in Epsom, Britain, January 12, 2021. REUTERS/Natalie Thomas REFILE - CORRECTING DATE

A temporary mortuary is seen in the grounds of a former RAF rehabilitation hospital, amid the coronavirus (COVID-19) outbreak, at Headley Court in Epsom, Britain, January 12, 2021. Picture taken with a drone. REUTERS/Natalie Thomas REFILE - CORRECTING DATE

A temporary mortuary is seen in the grounds of a former RAF rehabilitation hospital, amid the coronavirus (COVID-19) outbreak, at Headley Court in Epsom, Britain, January 12, 2021. Picture taken with a drone. REUTERS/Natalie Thomas REFILE - CORRECTING DATE

A member of the Rapid Action Force (RAF) fires a tear gas shell towards farmers as they try to cross barricades during a protest against newly passed farm laws on a highway at Dharuhera in the northern state of Haryana, India, January 3, 2021. REUTERS/Prashant Waydande

An airplane carrying British Prime Minister Boris Johnson is seen on the tarmac as he arrives from Brussels at RAF Northolt near London, Britain December 10, 2020. REUTERS/Henry Nicholls

British Prime Minister Boris Johnson walks from an airplane after arriving from Brussels at RAF Northolt near London, Britain December 10, 2020. REUTERS/Henry Nicholls

An airplane carrying British Prime Minister Boris Johnson is seen on the tarmac as he arrives from Brussels at RAF Northolt near London, Britain December 10, 2020. REUTERS/Henry Nicholls

An airplane carrying British Prime Minister Boris Johnson is seen on the tarmac as he arrives from Brussels at RAF Northolt near London, Britain December 10, 2020. REUTERS/Henry Nicholls

British Prime Minister Boris Johnson walks from an airplane after arriving from Brussels at RAF Northolt near London, Britain December 10, 2020. REUTERS/Henry Nicholls

British Prime Minister Boris Johnson sits in a car after arriving from Brussels at RAF Northolt near London, Britain December 10, 2020. REUTERS/Peter Nicholls

Members of the Rapid Action Force (RAF) walk at the site of the protest during a nationwide strike against the newly passed farm bills at Singhu border near Delhi, India, December 8, 2020. REUTERS/Anushree Fadnavis

A member of the Rapid Action Force (RAF) walks next to barricades at the site of protest during a nationwide protest against the newly passed farm bills on a foggy morning at Singhu border near Delhi, India, December 8, 2020. REUTERS/Danish Siddiqui

A member of the Rapid Action Force (RAF), wearing a protective face mask, is seen through barbed wire at the site of a protest against the newly passed farm bills at Singhu border near Delhi, India, December 1, 2020. REUTERS/Anushree Fadnavis

A member of the Rapid Action Force (RAF), wearing a protective face mask, is seen through barbed wire at the site of a protest against the newly passed farm bills at Singhu border near Delhi, India, December 1, 2020. REUTERS/Anushree Fadnavis

Scottish First Minister Nicola Sturgeon walks with service personnel from Navy, Army and RAF to observe the two-minute silence to remember the war dead on Armistice Day at St Andrew's House as the coronavirus pandemic limits public commemorations, in Edinburgh, Scotland, Britain November 11, 2020. Jane Barlow/PA Wire/Pool via REUTERS

Scottish First Minister Nicola Sturgeon walks with service personnel from Navy, Army and RAF (not pictured) to observe the two-minute silence to remember the war dead on Armistice Day at St Andrew's House as the coronavirus pandemic limits public commemorations, in Edinburgh, Scotland, Britain November 11, 2020. Jane Barlow/PA Wire/Pool via REUTERS

Scottish First Minister Nicola Sturgeon walks with service personnel from Navy, Army and RAF to observe the two-minute silence to remember the war dead on Armistice Day at St Andrew's House as the coronavirus pandemic limits public commemorations, in Edinburgh, Scotland, Britain November 11, 2020. Jane Barlow/PA Wire/Pool via REUTERS

Scottish First Minister Nicola Sturgeon observes the two-minute silence to remember the war dead on Armistice Day at St Andrew's House with service personnel from Army, RAF and Navy (not pictured) in Edinburgh, Scotland, Britain November 11, 2020. Jane Barlow/PA Wire/Pool via REUTERS

Scottish First Minister Nicola Sturgeon observes the two-minute silence to remember the war dead on Armistice Day at St Andrew's House with service personnel from Navy, Army and RAF in Edinburgh, Scotland, Britain November 11, 2020. Jane Barlow/PA Wire/Pool via REUTERS

Scottish First Minister Nicola Sturgeon observes the two-minute silence to remember the war dead on Armistice Day at St Andrew's House with service personnel from Navy, Army and RAF in Edinburgh, Scotland, Britain November 11, 2020. Jane Barlow/PA Wire/Pool via REUTERS

Scottish First Minister Nicola Sturgeon observes the two-minute silence to remember the war dead on Armistice Day at St Andrew's House with service personnel from Navy, Army and RAF in Edinburgh, Scotland, Britain November 11, 2020. Jane Barlow/PA Wire/Pool via REUTERS

Scottish First Minister Nicola Sturgeon observes the two-minute silence to remember the war dead on Armistice Day at St Andrew's House with service personnel from Navy, Army and RAF in Edinburgh, Scotland, Britain November 11, 2020. Jane Barlow/PA Wire/Pool via REUTERS

Scottish First Minister Nicola Sturgeon observes the two-minute silence to remember the war dead on Armistice Day at St Andrew's House with service personnel from Navy, Army and RAF in Edinburgh, Scotland, Britain November 11, 2020. Jane Barlow/PA Wire/Pool via REUTERS

Scottish First Minister Nicola Sturgeon observes the two-minute silence to remember the war dead on Armistice Day at St Andrew's House with service personnel from Navy, Army and RAF in Edinburgh, Scotland, Britain November 11, 2020. Jane Barlow/PA Wire/Pool via REUTERS

A RAF representative attends a remembrance service in Keele, Staffordshire, Britain November 8, 2020. REUTERS/Carl Recine

A RAF representative attends a remembrance service in Keele, Staffordshire, Britain November 8, 2020. REUTERS/Carl Recine

Britain's Prime Minister Boris Johnson poses with Flt. Lt. Ollie Smith from RAF, Able Seaman Laura Chisholm from Royal Navy, SSgt Ilaitia Vuki from British Army and Director of Fundraising Claire Rowcliffe during a meeting with fundraisers for the Royal British Legion outside Downing Street in London, Britain, October 23, 2020. REUTERS/Simon Dawson

Britain's Prime Minister Boris Johnson poses with Flt. Lt. Ollie Smith from RAF, Able Seaman Laura Chisholm from Royal Navy, SSgt Ilaitia Vuki from British Army and Director of Fundraising Claire Rowcliffe during a meeting with fundraisers for the Royal British Legion outside Downing Street in London, Britain, October 23, 2020. REUTERS/Simon Dawson

Britain's Prime Minister Boris Johnson speaks with Flt. Lt. Ollie Smith from RAF, Able Seaman Laura Chisholm from Royal Navy, SSgt Ilaitia Vuki from British Army and Director of Fundraising Claire Rowcliffe during a meeting with fundraisers for the Royal British Legion outside Downing Street in London, Britain, October 23, 2020. REUTERS/Simon Dawson

Britain's Prime Minister Boris Johnson poses with Flt. Lt. Ollie Smith from RAF, Able Seaman Laura Chisholm from Royal Navy, SSgt Ilaitia Vuki from British Army and Director of Fundraising Claire Rowcliffe during a meeting with fundraisers for the Royal British Legion outside Downing Street in London, Britain, October 23, 2020. REUTERS/Simon Dawson

Members of the Rapid Action Force (RAF) of Kolkata police wearing face masks take part in rehearsal for the Independence Day parade, after authorities eased lockdown restrictions that were imposed to slow the spread of the coronavirus disease (COVID-19), in Kolkata, India, August 11, 2020. REUTERS/Rupak De Chowdhuri

Britain's Prime Minister Boris Johnson speaks next to a Typhoon fighter jet at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson greets with an elbow bump inside a Typhoon fighter jet at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson visits families in the community centre at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson visits families in the community centre at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson visits families in the community centre at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks as he visits families in the community centre at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks as he visits families in the community centre at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson reacts as he visits families in the community centre at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS TPX IMAGES OF THE DAY

Britain's Prime Minister Boris Johnson speaks at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks to Group Captain Chris Layden at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson stands at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks to Group Captain Chris Layden at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS