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I have seen a photo of the PT76 in Chechnya I understand that it belonged to troops of the interior ministry??
Yes. PT-76B only in Chechnya during the first war is very limited use internal troops of the Ministry of Internal Affairs of the Russian Federation.
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A: Were would / could I buy decals for interior ministry troops
B: Is it a PT76 or a PT76b??
C: Are they just standard service vehicles or were they tweaked as such??
I have personally used the decals from the sets Eastern Express, you can also take the emblems of the sets of the BTR-80, the company Zvezda.
It was PT-76B. Standard tanks with different attachments as amended spare tracks, rubber side skirts.
My version of PT in Chechnya:
http://panzer35.ru/forum/44-10879-1