The Welsh Guards have been honoured by Rhondda Cynon Taf at a special ceremony in Pontypridd.
The bodies of Welsh soldiers Craig Roderick and Leonard Thomas, who were killed in Afghanistan, will return to the UK today.
The family of Welsh Guard, Craig Roderick, who was killed in Afghanistan this weekend say he has left a void which will 'never be filled.'
Wales Office Minister Stephen Crabb has welcomed the news that the Welsh Guards will be among the military personnel involved in the funeral. Their roles will include bearing the coffin, lining the procession route and forming a Guard of Honour.
During the latest tour of duty, members of the Prince of Wales's Company worked closely with Afghan security forces in Nahr-e-Saraj District to suppress insurgents and help the Afghan troops to take the lead themselves.
The battalion lost three members during the tour including Carmarthen-born Lance Corporal Lee Davies, 27, who grew up in Cardigan.
Lance Corporal Davies died after being hit by small arms fire while on working as part of a police advisory team in the Lashkar Gah district of Helmand province in May last year.
Major Ed Launders, Prince of Wales's Company Commander, said: "The tour in Afghanistan was extremely tough, but made much easier through the abundant support of the people of Wales which carried us through.
"It is a tremendous honour and privilege to march through Carmarthen and to display our gratitude."
1st Battalion Welsh Guards will parade through Carmarthen town centre today, after a six month tour in Afghanistan.
Starting at 12pm the Prince of Wales' Company will march from the town's TA centre, through Picton Terrace and Lammas Street towards the Guild Hall.
The Mayor of Carmarthen will take the salute and inspect the troops, before the parade makes its way back to the TA Centre along Queen Street, Spilman Street and King Street, for a reception.
The Prince of Wales presents Operational Service Medals as he welcomes home the 1st Battalion Welsh Guards who have recently returned from Afghanistan at Cavalry Barracks, Hounslow, West London.
More than three hundred soldiers from 1st Battalion Welsh Guards have paraded through the streets of Cardiff today after returning from a six month tour of duty in Afghanistan.
They held a memorial service to remember four colleagues who were killed in action.
They were Lance Corporal Lee Davies, Guardsman Craig Roderick, Guardsman Apete Tuisovurua and Warrant Officer Leonard Thomas.
But there was also happiness, with the young son of one soldier deciding to join in the march.
Jane Solomons followed the Parade.
One spectator couldn't resist joining in with the march. Little Wesley tried to keep up with his father as the soldiers marched past.
He was later rewarded with a signed rugby ball from Wales international Ryan Jones, who stopped by to support the returning men.
More than three hundred soldiers from 1st Battalion Welsh Guards have marched through Cardiff this afternoon after a six-month tour of Afghanistan.
The day started with a service of rememberance for the four members of the battalion who died during the operation. The total number of Welsh personnel killed has now risen to 32.