Yes Tim - last officail type was KC-135R - it has been heavily modified for the new role and according to Richard G is also used to transport USAF chief and senior staff which is probably what it was doing in Canberra - I presume it is still KC135R but the EC designator was used in an article I found whilst searching on the program - and had some interesting outer wing sensors/attachments.
Definitely a one off!
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