When the RAN were deployed to Jax, they did a det to AUTEC and stopped at KPBI to get gas, as was normal for all the USN squadrons. Because the aircraft were RAN property, all they had were NAVAIR Identiplates (for fueling at USN bases) but no AIRCARD and no one thought about how they were going to get fuel. At the end of the day, someone from NAVAIR provided the FBO a Cadillac Chit and the helos went on their way.
Fast forward several months and the FBO still was waiting for NAVAIR to pay them because, in standard NAVAIR fashion, they were slow-rolling the process. They finally paid, but now the Navy was short on 800 gallons of gas worth of money. I think it was finally settled shortly before I retired (3+ years later) that the USN would just be "paid-in-kind" by AUS the next time a US ship pulled in to Australia. Who knows if that ever actually got nulled out.