3 decal variants:
1. Arado Ar 66C, Nationalist Spanish A.F., 1937
2. Arado Ar 66C, Czechslovakia, airfield Přelouč, 1946
3. Arado Ar 66C, Romania, was captured from the Luftwaffe, 1945
After the establishment of the Störkampfstaffeln in the Luftwaffe, the Ar 66 C began to play the role of night bombers, following the example of Soviet troops equipped with Polikarpov Po-2 or Polikarpov R-5 aircraft. Reconstructions took place in aviation workshops at the airport in Německý Brod. On October 7, 1943, the squadrons of light night bombers were renamed the Nachtschlachtgruppen. "Céčka" then operated in 1., 2. and 4./NSGr.2, NSGr.3, 2./NSGr.4 and NSGr.5 in the USSR, NSGr.8 in Finland and 3./NSGr.11 and NSGr .12 in Lithuania.