Kate, Duchess of Cambridge, has the position of Honor Flight Commander of the RAF Air Cadets.

This is in keeping with Kate's well-known passion for young people and education, as the Air Cadets train 12-20 year olds in the areas of flying, outdoor and leadership.

It may be that Meghan has expressed no interest in a military appointment of her royal roles, as her royal subjects focus on social issues, environmental protection, and women's leadership.

The Duchess of Sussex does not currently have British citizenship, which could prove an obstacle to obtaining a position in the British Armed Forces if she does not change her citizenship status in the future.

In addition, the Duchess has been a member of the royal family since May 2018, leaving little time to fulfill more royal duties.

In January of this year she received her first royal patronage and became patron of the National Theater, Mayhew, the Association of Commonwealth Universities and Smart Works.

Kate became patron of the Royal Foundation for the first time in October 2011, and so the two duchesses took on the important roles after their royal weddings over a similar period.

The Duchess of Cambridge received her appointment as Air Philosopher of Prince Philip in December 2015.

READ MORE: Did Meghan hit Kate with the decision of Baby Archie?

Meanwhile, Princess Anne's impressive royal record includes 27 military appointments.

The Princess Royal rode this year, along with Prince Charles, Prince Andrew and Prince William, in their position as Colonel of the Blues and Royals.

Prince Harry's mother Princess Diana also had military honors, including for the regiment of the Princess of Wales.

However, Sarah Ferguson, when she was the Duchess of York, had no military appointments in the Royal Navy, despite her husband's longtime service, Prince Andrew.

Her daughters, Princess Beatrice and Princess Eugenie, are not high-ranking "working" kings and have no military honors.

Camilla, Duchess of Cornwall, is now volunteering, including as a member of the Desert Rats Association in memory of her father.