That is still recruitment based on region; Assam Regiment is also not the only regiment serving the region. You forget the Naga Regiment and the Arunachal Scouts.
Naga regiment is mixture of Naga & Kumaon, Gharwal & Gorkhas. (Mostly Paharis). It's not specifically Naga based. Indeed, More people from Pahari from Uttrakhand are part of it. That's why HQ is at Ranikhet. Arunchal Socuts is just a small group of few thousand. It works under Siliguri corp. Army recruit them because they are aware of mountain terrain of Arunchal.
Jats, Dogras, Rajputs, Sikhs all have their own regiments.
It's because of British martial race concept. There are many ethnic/cast in all these regiment except Sikh one AFAIK. Even Rajputs don't belong to one state but many states. These regiments recruit from their 'catchment areas', areas that traditionally belonged to their community. That doesn't mean that a non-Rajput is unwelcome in the Jat regiment, or a Jat is unwelcome in the Dogra regiment. Tradition plays a major part in motivation on the battlefield.
These are not General Vaidya's mixed regiments.
Don't know about General Vaidya version. Regiments recruitment areas are concentrated to traditional 'catchment areas' because there it's easy to get large no. of people for army. Like Haryana, Punjab, Uttrakhand. But all Regiments have mixture of people. Anyone can join any regiment. So, There is not much regionalism. Yes, Jats prefer joining army more than Baniyas, But this is as per tradition and nothing to do with ethnic and region. It's more to do with tradition. So, Army still following such tradition, I suppose. But nevertheless, Officials comes from NDA.
Obviously the rule doesn't apply to officers. They come from all quarters. That is the unity in diversity Param was talking about. You are just pulling a Pakistan when you speak of regional cultures being anti-national.
Yes, It's unity of diversity on which Modern India came into existence. You know too much of Pakistan
, Don't know about that but I do know there was ethnic violence in Karachi sometime back but no such issue in India.
, So don't mention Pakistan all that time when discussion is about India. It's mostly South-North theory which i find unnecessary that also only on DFI. Then few come and add more spice to make it early weekend