Very good text if I may say.
My corrections are limited. For instance, it is true that only few S-125M battalions used P-18 radars, but also not completely accurate that others used P-15 as main radar.
Most of the S-125M battalions used P-12 as a main radar and P-15 only as additional one. The Command of 250th Brigade used 2 P-15 radars for the purposes of Brigade command point, but both of them were hit and lost very qiuckly.....
Also....Zoltan Dani did not perform any kind of "modification" to radar P-18.
And at the end....155. missile regiment S-75M Volhov was located around Zagreb (Republic of Croatia) during the 1966-1991 period. Then it was moved to Banja Luka (then Yugoslav Republic of Bosnia and Hercegovina). But when the war started, no matter that it was planned to move to Serbia, it remained in the newly formed Army of the Republic of Srpska (then Serb self proclaimed army and state in Bosnia and Hercegovina).
I am not sure whether P-18s were moved from there to Serbia, but it is possible. Anyway, there were no P-18s in S-75M Volhov regiment in Republic of Srpska, only P-12 and P-15.
Do not take this as a criticism. As I said, the text is very well....these are just minor corrections.