A mate of mine was involved in a Junglie E and E exercise and during his travels came across one of the adjudicator's Land Rovers unattended which he regarded as fair game and borrowed it to save him walking out of the exercise. In his return to wherever the finishing line was he passed several of the hunters who recognised the vehicle and waved him on. He just left the vehicle in a car park near the finishing point and ran the rest, not mentioning the Land Rover bit. The landie was not found as they weren't looking for it in carparks...
A helluva stink erupted when the vehicle was reported stolen and he had to fess up. The subsequent carpeting was only going to end badly as the brass (Marines I think) with pride piqued were out for blood having had their security and checking procedures so badly shown up by a mere Lt. pilot but his defence was that the exercise briefing was to use all initiative and legal means to evade capture and no mention was made of not borrowing a service vehicle that he was licenced to drive. He got away with it, just. The powers were furious.