I know someone at an air base that has Hercs somewhere in Wilts who was criticised for having only 40% of the storage area occupied with spares.
It was pointed out that half the empty building was between the tops or the racks and the roof. The rest of the missing spares were either on their way forward or on their way back to get fixed.
The mission was NOT to have full shelves.
OTOH, the Just in Time principle can be seen every weekend in the papers: Order XXXX widget, allow 28 days for delivery = When we get all the punters orders in we will fax China for the widgets. Then we will air freight them to you once we have bought them.
I just hope the next war is not against our major supplier.