"our existing 2 Group fleet was partially "civilianised", and some aircraft were available for charter at commercial rates"
Well for a start that means that part of the fleet would not longer be military - so are you:
a) assuming that there are an excess of e.g. C130 assets that are not needed? or
b) are you advocating buying more civil aircraft on top of the existing military ones?
a) is false to anyone with any sort of appreciation of reality, and
b) would obviously cost more. The end.