Since King Charles III shared in February that he’d been diagnosed with cancer after receiving treatment for an enlarged prostate, health updates for the monarch have been short, positive, and not terribly specific. For example, at his first public engagement since the diagnosis, a late April visit to a cancer center, he told a fellow patient that he was “not too bad,” and characterized the diagnosis itself as “a bit of a shock.”

On Monday, however, Charles visited the Army Aviation Centre in Middle Wallop, Hampshire alongside son Prince William, and revealed a side effect he’d experienced while chatting with a soldier who had also undergone chemotherapy. British Army vet Aaron Mapplebeck shared with the king that he underwent nine weeks of chemotherapy for testicular cancer in early 2023. According to The Sun, Charles commiserated with Mapplebeck over experiencing a loss of taste as a side effect of cancer treatment.

Charles and William visited the military center for a ceremony formally passing the role of Colonel-in-Chief of the Army Air Corps from Charles to William. Standing in front of an Apache helicopter, he addressed the assembled military personnel alongside his eldest son.

“Let me just say what a great joy it is to be with you even briefly on this occasion,” Charles said, “but also it is tinged with great sadness after 32 years of knowing you all, admiring your many activities and achievements through the time that I've been lucky enough to be Colonel-in-Chief of the Army Air Corps.”

The Army Air Corps is also the unit that Charles’s younger son, Prince Harry, served in, becoming certified as an Apache commander and co-pilot before he ended his military service. Harry and his wife Meghan Markle resigned as working royals in 2020, though they retain their titles as Duke and Duchess of Sussex.

In fact, Harry was also in the United Kingdom over the weekend, following a trip to Nigeria with Meghan. He held an event commemorating 10 years of the Invictus Games, his veteran and active duty-focused athletics competition that champions mental and physical wellness for armed services personnel. Though Harry reportedly invited his father and brother to the ceremony, they did not attend.