| formed from elements of 4th Battalion, The Royal Welch Fusiliers (TA) │ | formed from elements of 6th/7th Battalion, The Royal Welch Fusiliers (TA) │ | formed from elements of 4th Battalion, The Royal Welch Fusiliers (TA) and 6th/7th Battalion, The Royal Welch Fusiliers (TA) and 2nd Battalion, The Monmouthshire Regiment (TA) and 4th Battalion, The Welch Regiment (TA) and 5th/6th Battalion, The Welch Regiment (TA) │ | formed from elements of 2nd Battalion, The Monmouthshire Regiment (TA) │ | formed from elements of 5th/6th Battalion, The Welch Regiment (TA) │ | formed from elements of The Pembroke Yeomanry (Castlemartin) (TA) and 4th Battalion, The Welch Regiment (TA) │ | |
| Creation of the Territorial and Army Volunteer Reserve | ||||||
| │ | │ | │ | │ | │ | │ | |
| 1967: | 4th (Territorial) Battalion, | 6th/7th (Territorial) Battalion, | │ │ | The Monmouthshire (Territorial) Battalion, | 5th/6th (Territorial) Battalion, | 4th (Territorial) Battalion, | 
| The Royal Welch Fusiliers | The Welsh Volunteers | The South Wales Borderers | The Welch Regiment | |||
|  |  |  |  | |||
| │ | │ | │ | │ | │ | │ | |
| 1969: | reduced to cadre as 4th Battalion, | reduced to cadre as 6th/7th Battalion, | │ │ | reduced to cadre as The Monmouthshire Battalion, | reduced to cadre as 5th/6th Battalion, | reduced to cadre as 4th Battalion, | 
| The Royal Welch Fusiliers | │ | The South Wales Borderers | The Welch Regiment | |||
| │ | │ | │ | │ | │ | │ | |
| 1971: | │ │ | │ │ | │ │ | 3rd (Monmouthshire) Battalion, | 5th/6th (Glamorgan) Battalion, | 4th (Carmarthenshire and Pembrokeshire) Battalion, | 
| │ | │ | │ | The Royal Regiment of Wales | |||
| │ | │ | │ | │ | │ | │ | |
|  |  |  |  |  | ||
| 1971: | 3rd (Volunteer) Battalion, | 3rd (Volunteer) Battalion, | 4rd (Volunteer) Battalion, | |||
| The Royal Welch Fusiliers | The Royal Regiment of Wales (24th/41st Foot) | |||||
|  |  | |||||
| │ | │ | │ | ||||
|  |  |  | ||||
| 1993: | │ │ │ | HQ Company, B (Rork’s Drift) Company, C (Pontypridd) Company, | A (Swansea) Company, | |||
| │ │ │ │ | 2nd (Volunteer) Battalion, The Royal Regiment of Wales (24th/41st Foot) │ | |||||
|  |  |  | ||||
| 1999: | A (Royal Welch Fusiliers) Company, D (Royal Welch Fusiliers) Company, | B (Royal Regiment of Wales) Company, C (Royal Regiment of Wales) Company, | ||||
| The Royal Welsh Regiment │ | ||||||
| 2006: | 3rd Battalion, The Royal Welsh | |||||
|  │ | ||||||