tonight I was finished hot rearming and sitting on taxi-way waiting for follow on orders. In came 3 nme 109's that commenced to vulch. Well that's ok, what I would like to know is why the warning didn't sound off or does it in SE, and why our fld ack was not shooting? All guns were visibly functional in appearance. I know the nme fld ack could shoot because i chased a 109 who tried to recover to his fld after I engaged him and I had to dodge the fld ack as I egressed out.