USMC UC-12W 168206 was noted at Shannon today,December 11th.
The ultimate destination of this airplane is Futenma or Iwakuni.
This airplane will displace a UC-12F,which will almost certainly transit Europe within the next 2 weeks as it returns stateside.
This is the first of 3 UC-12W due for delivery in the coming few months.
USMC UC-12Fs 163553,163558 and 163559 should be returning to the States as a result.