"Soviet divisions are divided into three categories, depending on the number of `bears' absent in peacetime:
Category A-divisions which have 80% or more of their full strength
Category B-those with between 30% and 50%
Category C-those with between 5% and 10%..."
Source:
http://militera.lib.ru/research/suvorov12/04.html.
"The Category A divisions were certified combat-ready and were fully equipped. B and V divisions were lower-readiness, 50–75% (requiring at least 72 hours of preparation) and 10–33% (requiring two months) respectively." [The V division may be a typo] Source:
http://en.wikipedia.org/wiki/Soviet_Army.
From these two sources we can say the Category letter alphabet rating refers to the readiness of the division.
Yeah, those division would be Motor Rifle Divisions or MRDs, but not required as the Category does not denote the type of division. A Rifle Division (RD) stationed on the Chinese frontier could have a Category B or C, or even an A designation for example.
So, are you hunting Bears?