Another source gives 16 military variants abbreviated to the RDD; later models used Jumo 4 (Junkers Jumo 004?) and AN-1 engines. (in Russian)ANT-25 (RD) at Monino Aircraft Museum website.
Some sources gave other abbreviations of the ANT-25: RD – Razvedchik Dalniy, i.e. Reconnaissance Long-range or DB – Dalniy Bombardirovshik, i.e. Long-range Bomber (in Russian) D. Nikitin, Time of the great flightsArchived 2011-08-22 at the Wayback Machine, "Na Warsawke" № 7 (106) July 2006
Some sources gave other abbreviations of the ANT-25: RD – Razvedchik Dalniy, i.e. Reconnaissance Long-range or DB – Dalniy Bombardirovshik, i.e. Long-range Bomber (in Russian) D. Nikitin, Time of the great flightsArchived 2011-08-22 at the Wayback Machine, "Na Warsawke" № 7 (106) July 2006
