Yep, it was a C17
Heard the distress calls on ML CEN today, descended initially to 10,000ft, then 6,000 ft and was 250nm from LM. Coastwatch 705 was called to assist, but not entirely sure what assistance was expected/given.
Just a 'precaution' when the situation was not totally clear, for escort/spotter/comm relay, particularly if the situation had of developed into an off airport arrival.
Easier/better to call off the 'support' if its not required, than try to organise something a tad too late!
An escort is quite a standard response if there's even a sniff of not making an airport, especially in remote areas.