I hope you mean as an adjuct to see and avoid it even applies in 'VFR' conditions with TCAS I or II on TA mode
That I do mainly because I like the scenery. Having flown a fair amount of aeros I reckon my look out is as good as most but I know to my cost it is vey poor at spotting the one that is going to hit you, but not too bad at the rest. The trouble is that doesnt help much.
The great thing about TAS and including a large MDF in your scan which also produces an audible warning is that the combination of old fashion technology (the mark 1 eyeball) and modern technology produce, IMHO, is a far more reliable means of detecting the enemy.
Here in a combat zone, it's a little different.
Hmm cant imagine that much traffic around in a combat zone, I guess you lot arent doing your job very well if you havent managed to supress most of it.