TEXT:   Russian Tank Brigade 
  December, 1941
  x 2
  x 1
  x 4
  Motorized
  Infantry
  Battalion
  x 1
  x 3
  x 1
  Tank
  Regiment
  x 1
  Tank
  Brigade
  Anti-
  Aircraft
  Battalion
  x 1
  x 2
  By Greg Moore
  gregpanzerblitz.com
  September 2007
  In December, the Russians decide to pare their tank brigades down even further.  The recon battalion was
  dropped and the number of light tanks was reduced, although the improved T-60 was now performing the light tank
  role.  Specialized tank-riding SMG companies make their first appearance.
  x 1
  Note: the SMG unit above rode
  on tanks to add close support
  and usually was not part of the
  infantry battalion.
  
SOURCE: textdata/thevault/Panzer Leader & Panzer Blitz/Operation Barbarossa/TankBrigadeDecember41.pdf