In late 2002 and early 2003, Swiss Air Ambulance REGA introduced three new built Challengers 604 registered HB-JRA (c/n 5529), HB-JRB (c/n 5530) and HB-JRC (c/n 5540). All three were replaced by newer Challenger 650 in 2018. While HB-JRA was donated to the Transport Museum in Lucerne, the other two were sold to the Swiss AF, becoming T-751 and T-752 (pictured). Talks about the Swiss AF obtaining a real transport plane like the C-130 or the C-295 were shelved a few years ago, so the two old CL604's based in Duebendorf and part of the "Luftransportdienst des Bundes" (LTDB) soldier on instead.