Most of us know that NATO's airborne early warning aircraft sport the Luxembourg flag and fly with the LX-prefix. Please refer to the NATO order of battle for those!
This is about Luxembourg itself. Since 2005 the Police Grand-Ducale operates an MD902 helicopter on policing duties. Recently, the police acquired two H145Ms. These are crewed by air ambulance pilots and based at Luxemburg/Findel. They sport "Police Lëtzebuerg" titles, and a Luxembourg roundel.