Minor Comm and Equipment Changes
I added this to cover the usual possible changes in communications radios, usually in the cockpit for air traffic and military use.
I am not sure if there are any changes at all in the Airseeker, vice the USAF Rivet Joints, but the UK usually requires some UK-sourced radios when they purchase equipment from abroad. This was one of the big changes in the original RAF Hercules.
Just think of all the changes needed when the UK required Spey-powered Phantoms instead of using J79 engines. Lots of cost and a loss of performance.
We do the same with aircraft the US purchases, including the original Harriers.