I don't get it, they are helicopters, who in the right mind would stick them on an airfield and not disperse them to the surrounding fields.
If fuel and arming are issues, set up refuelling locations in fields and separate arming points, at least do not park them on a concrete apron in pretty lines where the blast damage would be increased.
Surrounding fields and earth might absorb some of any near misses and being dispersed lessen your losses.
Talk about over confident and amateur hour.