BBC News: US refuelling tankers fly out of RAF Mildenhall

These are KC 135 planes and one expert that we spoke to from the think tank RUSI said that these are basically critical assets for the US ... Christoph Bergs, this particular expert we spoke to, said that it is a promising sign that these tankers appear to have mainly dispersed across Europe, suggesting that it's a temporary precaution by the US rather than going back to the US."