Why no China?

[Olefin]

per various sources - pre-1987 - with transition occurring in their army from then on into the late 90's/early 2000's from divisions to brigades

Each field army division under the old system had over 12,000 personnel in three infantry regiments, one artillery regiment, one armored regiment, and one anti-aircraft artillery battalion as well as support units

The garrison units were smaller as they usually only included infantry and artillery and typically only had three regiments of infantry and one artillery regiment

If you look at how the combat capable divisions were organized during the V1 and V2 timelines they were organized as follows:

three regiments (of three battalions each plus support units) (either armor or infantry) and then a fourth regiment that was either armor (in an infantry division) or infantry (in an armor division), an artillery regiment, an anti-aircraft regiment (or battalion), and then signals, engineer, recon, chemical defense battalions or companies and combat service units

There were many differences between category A and category B units - and the relative lack of APC's at the time meant that outside of armored divisions many infantry were transported in trucks. Similarly there was a lack of SPG's so mobile artillery in many cases was rocket artillery and most divisions had towed guns.

Also category A units had the best equipment while category B made do with older tanks and APC's - or in many cases were truck borne only as to transport

The current army is somewhat different as they use the brigade concept - so if you are looking at Twilight 2013 you are looking at brigade formations

Example - typical current PLAGF artillery brigade has 4 artillery battalions each with 18 guns in 3 batteries and 1 self-propelled anti-tank gun battalion (18 vehicles)

Currently a PLAGF armored brigade after the 1990's reorganization has 4 tank battalions with 124 main battle tanks, each composed of three tank companies of 31 tanks (10 per company and one battalion commander tank), a single mechanized infantry battalion with 40 APC's, one artillery battalion with 18 SPG and one anti-aircraft battalion

The tank divisions that the Soviets would have faced in V1 and V2 would have had three full regiments of tanks, each with 3 battalions each - thus 93 tanks per regiment with a total of around 280 tanks per division plus a full infantry regiment with (in a category A unit) some 120 APC's of various types