Bullmoose Bailey stated at the end of the above post:
I see the UK basically doing the same thing in eliminating the regimental histories of so many great units.
I have little knowledge of US military organisation and potential reform, but to cite the reforms undertaken here in the UK as part of changes in the USA is odd. Yes many army regiments have disappeared over the years, often dictated by finances, but not always. Often attempts have been made to keep regimental history alive, through cadre units who are often reservist (TA).

'Joint' working has been around for a very long time, but as the recent series of top service leaders speeches showed each took a single service stance.