AC, another story that did the rounds was when the C-130 was first purchased TACAN was standard fit but there were no TACAN stations in Oz, $100,000 to Lockheed for rework to rip them out, so the story went. Navy was no better, when it purchased the Huey they came with the all beaut US dial any frequency you like radios, to make them compatible with the Sea Venom, Vampire, Gannet they ripped them out and replaced them with I think from memory it was called a TR1939 radio. It was said the 1939 was the date the radio was first put into service and was used in the Spitfires and Hurricanes during WWII, five channel, crystal controlled. To make sure the original radios couldn't be refitted, well not without a hell of a lot of work, the wiring looms had all been cut, it was said with garden shears, and I'm not too sure if that wasn't the truth, can't have unused cannon plugs flopping about I guess.