The regiment's formation was announced on 16 December 2004 by Geoff Hoon and General Sir Mike Jackson as part of the restructuring of the infantry and it was actually formed on St David's Day, 1 March 2006.

[8][9] The 3rd Battalion, The Royal Welsh is an Army Reserve light infantry battalion based at Maindy Barracks in Cardiff, with company locations in Swansea, Pontypridd, Aberystwyth and Colwyn Bay.

[12] Meanwhile Firing Line: Cardiff Castle Museum of the Welsh Soldier is based at Cardiff Castle[13] The regiment's cap badge is a representation of the Prince of Wales's feathers (formerly the cap badge of the Royal Regiment of Wales), while the hackle of the Royal Welch Fusiliers is worn by all NCOs and Other Ranks.

[14] The regiment includes a goat, presented by the monarch; this is not a mascot but a ranking soldier.

Band members agreed to honour all charity appearances during this period, but without pay.