In this screenshot, my pilots are at low altitude. The SA-6 in the north approach does not fire during the site/bandit fire phase. I moved my aircraft up to high altitude next turn and both the SA-6 and the SA-2 didn't fire. It seems the whole northern approach was asleep.[:D]
I had came in from the south/southwest at High alt, High in South approach, went to Low while moving to target area.

