Probes
ALL Mk3 aircraft have probe provisions (plumbing etc already in), the RAF just havent procured enough for each aircraft. It is role fit.
All the DMRH are also plumbed for AAR hence the Mk3As also have the provision. RDAF have also not procured probes for all their aircraft
Of course as neither the RAF or RDAF have a suitable helo AAR tanker in their fleets the probes arent much use.
AWH finished the proof of concept trial with a Mk3 last year so it all works, just need an RTS now ( I am sure the RAF will jump at the chance to AAR if they ever get it)
DM