My only memory of the EC-121 (apart from watching Connies flying overhead when I was younger) was on the first visit by the USN one to Lossie/8 Sqn. On a short demo trip we were impressed at how much more kit they had, how different/easy it was to fly compared with the Shack, and the final show stopper was this wonderful thing in the galley called a 'microwave oven' that the crew had self fitted! At this time they were unknown in the UK, and in fact it must have been nearly 10 years before the first very expensive ones appeared in Curry's!