Oap
The reason why you would be asked to squawk individual codes would be so we didn't barrel into the wrong formation at low level and so we knew that we had the correct one we had briefed to do affil with. Do you remember those days? When within a 60x30 mile box there might be 4-5 four ships or pairs transitting at low level?
By the way, you couldn't get a weapons solution on an IFF return in the F3, it needed to be an established primary RADAR comtact.
LJ