Check list of Air Force fighter regiments (iap VVS) at
http://allaces.ru/cgi-bin/s2.cgi/sssr/struct/p_iap.dat- there are many duplicats! 2 x 6th iap, 2 x 10th iap,
4 x 12th iap.
In 1930es regiments were numbered within Army Regions. 12th iap could exist in 4 regions.
During the war regiments were numbered according to mobilization plans - that is why new regiments (or reformed regiments) didn't get sequential numbers. There are many numbers that are missing, some regiments with higher numbers were actually formed before the lower number regiments.
Official list of all Guard's regiments (from 1960) is here
http://tashv.nm.ru/Perechni_voisk/Perechen_12_02.htmlGuard's regiment numbering was more-or-less sequential. There are missing numbers (12th for example) and some higher number regiments were in combat before lower number regiments...
Official list of all Air Force (VVS) regiments (from 1960) is here
http://tashv.nm.ru/Perechni_voisk/Perechen_12_01.htmlyou can see there that some regiments were formed twice!
You understand that Air Force and Navy were two entities...
HTH,
KL