1st The Queen’s Dragoon Guards, The Welsh Cavalry turned 60 on Monday.
Commemorations took place across Cardiff, with The Prince of Wales also attending the events in the city.
The regiment formed through the amalgamation of the 1st King’s Dragoon Guards and The Queen’s Bays second Dragoon Guards.
On Monday, the Guards' Standard was laid up.
It will join the ranks of standards in the rafters of the Cathedral, forever a reminder of service and sacrifice.
Those who died during service were also remembered with a memorial which was given its permanent home in Llandaff Cathedral, Cardiff.
Warrant Officer 2 Dale Thomas said:
"It's a huge privilege for our Colonel-in-Chief to be there at this moment as well as the laying down of the Standard."
After the formal ceremony, Prince Charles spoke with soldiers and also with family members whose loved ones are listed on the memorial.
Cherry and Robert Llewelyn, whose son Lance Corporal Richard Scanlon died in Afghanistan in 2011, attended the ceremony.
They told Forces News he lost his life four days after his 31st birthday, and they came down to the ceremony at a "good time to remember him."
Trooper Alexander Smith said:
"When we collect in Cardiff, it has a different meaning, because it's where we're all for from, and we all sort of have a similar background of growing up in the Valleys or something similar."
After the service, those who attended had the chance to meet one more member of the service.
Welsh Mountain Pony Trooper Emrys Forlan Jones 959, the regimental mascot, also made an appearance.