Soi

[DMZ-LT]

My one finger is going to bleed after all this typing , but I got to ask. As a plt leader in Germany , prior to RVN , I had a Signal Operating Instructions ( I think ) book that had lots of freq's and and was a very secret book . As a plt leader in RVN I had no SOI. My track had two radios one at plt freq. , that could go off on a prick 77 and talk to me and another radio that I talked to Troop and Squadron on . I also could talk to Arty but don't remember how I got their Freq. How about it you radio guys , did you have an SOI ?