The total is 18 Half Tracks and three A/T guns to be distributed among three Combat Commands.
Each battalion has six Half Tracks, mostly the M3A1 of Hasegawa but also a few M3 from Airfix and Italeri. Three are for the infantry companies, one is a command vehicle and another is a mortar 81mm carrier...
...complemented by a 57mm gun for each battalion (converted Irregular Miniatures guns) and...
... the tows which are Hasegawa. I built them with the canvas covers so they can be distinguished as gun tows.
One of the battalions have in-action figures (hard plastic Fujimi) much to American taste as it could be seen in Syria in the past morning. The HT is Airfix.
This Command HT is a Corgi Die-cast. Fits nicely with the lot as it is quite detailed
The other two Command HT are Italeri double kits and have radios and different interior details on main crew compartment.
This one is everywhere: the mortar variant exists in each tank and mechanized battalion. This Hasegawa (what else?) model has a Matchbox crew taken from a M7 SP.