Sig Op = Signals Operator MOC 215, an amalgamation of the former 211 (radio operator) and 212, (telphone operator).
Basically, the guy that sets up and uses the radio.
Amalgamation of Tel op (Tele-type, not telephone, data over HF, the linemen have handled most of the telephone stuff for quite a while...) and Rad Op (Radio Operator) actually.
Tac rad is to a sig op what section attacks are to an infanteer... basic stuff... instructing on the equipment, strategic HF, sattelite, signals dispatch, microwave connections, electronic warfare, all sig op stuff

In fact, in a tac-rad CP, we're not supposed to use the radio, the officers are supposed to be the one's talking to the troops, we're just supposed to set up the equipment, then monitor for VP.
And to tie it to the thread, we eat well while we do it
