I think thats just one of those stories that gets around.
Theres a story floating around the Coast guard similar to this.
Our story goes something like this...
A c130 crew form AIRSTA X flys to hawaii to do mission XYZ and get a rental car whily TAD. On the rental agreement they read that the car can be returned to any rental car ageny in the US. They figure if it says it, it must be true. So they load up the car, head back over the pond, once back where ever they are from they return the car. Car company freaks but cant do anything....
Another story is similar but with power carts, aircrew flys in, they have a hard time getting a power cart, once they finally get one they decide to keep it. They leave and the CO of the unit calls them up looking for a power cart and makes them come back. They deep six it before getting back. No more power cart.
It might be true but it might just be sea stories.