The RPN is pretty new for me here.

The BUK-M unit used to have KP, SOC, SOU, and PZU.

It seems that the elevated RPN is against low altitude penetrators...
... designed after the OIF flop of the Patriots?

Hpasp
Free SAM Simulator, "Realistic to the Switch"
(U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.)
http://sites.google.com/site/samsimulator1972/home

Book from the author - Soviet Nuclear Weapons in Hungary 1961-1991
https://sites.google.com/view/nuclear-weapons-in-hungary/
thumbsup