First, I'm curious on how the heck they get insurance cover on the aircraft...I don't think even Lloyd's would write cover! Also, (and much more importantly) what about aircrew insurance cover?!
As for going into a war zone, I think we all know that this ain't new. During Vietnam, my father was chief engineer on tankers hauling a few bajillion gallons of avgas up the saigon river. He told me that all the way up to the port, he would hear bullets pinging off the hull, they were hit by RPG's and had a few morter rounds splash river water all over them. He DID get hazard pay, but he also had a really, really good union behind him.
For the comment about a morter hit on an aircraft stand (when the A/C was not there, thank God)...I would think that they would move the parking stands around? Otherwise, all someone needs to do is survey the sites for the morter teams and BOOM!
Stay safe guys!