Treadigraph, these 'MO' F-15Es are/were from Mountain Home AFB in Idaho. The 'MO' unit traded-in their F-111s in the 90s and re-equipped with F-15Es.
During assorted unpleasantnesses in the Middle East in the noughties and teenies they were one of the Wings that provided an 18-aircraft detachment, usually to Al-Udeid (the others were those from Lakenheath and from Seymour-Johnson AFB in the USA).
The ones this week (12 a/c) arrived at Mildenhall on Monday and departed on Thursday morning; one of them went tech, and didn't depart the UK (red-light on the cockpit coffee-machine?). I believe that they went to Jordan this time, but I don't know how long for. There are suggestions that if the Jordan exercise was called-off there was a back-up exercise somewhere in SE Europe ... maybe they will head to SE Europe after Jordan?