Soliders from the 2nd Battalion the Royal Welsh have been on parade for the last time today, before they merge with the 1st Battalion.
It is one of 17 major units being lost as the size of the army is cut.
Hundreds of people came out in Penarth in the Vale of Glamorgan to greet the soldiers.
Soldiers from the 2nd Battalion the Royal Welsh have marched for the last time today. In the new year the troops will merge with the 1st Battalion. A parade today in Penarth was led by Taffy the Regimental Goat and the Band and Corps of Drums of the Royal Welsh.
The merge of the regiments was announced as part of the Army 2020 structure.
Soldiers from 2nd Battalion The Royal Welsh hold a freedom parade through the streets of Llanelli later.
The parade begins at the Selwyn Samuel Centre at 12 noon and will progress to the Town Hall for an inspection.
Soldiers will then be joined by a contingent of cadets from the Llanelli Company of the Dyfed and Glamorgan ACF, and will march up Church Street, Bridge Street, Thomas Street, Park Street and Stepney Street, before returning to the Selwyn Samuel Centre at around one o'clock.
They will be led by 'Taffy' the regimental mascot, and will be accompanied by the Royal Welsh band.