OPEC 23: KC-10A with tail 87-0118 flying over the northwest part of Holland at 30975 ft. heading northeast, showing full Mode-S details and therefore visible on my radarscreen . Comms with UACC Maastricht on 136.4650 MHz (radar sector Jever low).
GOLD 21: working with UACC Maastricht on 136.4650 MHz (radar sector Jever low) > UACC Lippe on 130.1500 MHz (radar sector ?), nothing on my Mode-S.
REACH 174: KC-135R with tail 58-0058 working with UACC Maastricht on 132.0850 (radar sector Delta high).