Steve asked -
“BTW, there is the Royal Navy, the Royal Air Force, but the British Army. Why is that?”
It goes back to the Middle Ages when counties had regiments , so my local one which was named way back is The Royal Warwickshire Regiment .
Where I live now is the home of The Royal Middlesex Regiment .
The personal bodyguards of the Royal Family took the title Royal , as in Irish , Scots and Welsh Guards .
Cavalry were Royal Dragoon Guards and so forth–or even fifth .
The Scots , Welsh and Irish also had the Royal title , so there’s the Royal Scottish Fusiliers , Royal Welsh Fusiliers , and the Royal Irish Rifles .
Of course , there are some awkward buggers like the Black Watch who , being Scots , might not have been too happy with the Royal title . But they were given a Royal Warrant for knocking the crap out of various foreign johnnies (usually by lifting their kilts , so impressing the female natives and making awe in the males .)
But , without exception , they vow loyalty to Queen and Country . Or King , whoever’s boss at the time .
The supporting regiments also have the Royal Title , such as the Royal Engineers who have the claim of being the oldest regiment in the British Army , a claim exceeded by the Royal Marines who were and still are armed troops who keep discipline on board ship , but the Royal Marines insist they are neither Army or Navy .
tac , being an ex Royal Corps of Intelligence chappie (I think) may be able to throw more light on these things .
Mike , ex Royal Air Force