During the Cold War years, one of the US Army’s forward deployed aviation units in Germany had an instance where a helicopter flight school washout took a UH-1 up for a joy ride. He was arrested when he landed and the command responded by locking up their birds while on the ground. Then they had an alert and the guy with the keys to unlock the birds had taken them home with him.
Knowing what bureaucratic nightmares schools are....you have to have triplicate requisitions submitted six weeks in advance.