They had natural-metal ex-Soviet AF MiG-21PFMs and MiG-21US.
Known side-numbers in 1982:
MiG-21PFM - 001-012
MiG-21US - 101, 102
Sometimes later a few more PFMs arrived to the country, I seen photos 016,024,027...
Here is a photo of a memorial:
http://www.legendtour.ru/rus/mongolia/foto.shtml?nalaikh_aerodrom_16b.jpg
These planes got camouflage later:
http://www.photoblog.com/Bagabandi/2008/09/23/
Last training flights with the MiG-21 were monitored in 2003.




