As far as I know, when the King's Royal Rifle Corps and the Rifle Brigade merged, they became the Royal Green Jackets. The Royal Gloucester, Berkshire and Wiltshire Regiment became the RGBWLI. They (along with other glorious regiments long lamented) became The Rifles, but lost the prefix 'Royal'. Why? I would have thought that once won, no-one would give up the title 'Royal' willingly. Any army that can think that the RGBWLI sounds OK as a Regimental name can't be too bothered that 'Royal Rifles' sounds awkward.