ATGM availability

[Imp]

Hi want to pick brains of people who have served or done some research as having trouble finding details.

Want a rough rule of thumb for ATGM availability, generalising here as obviously varies due to formations not sticking to on paper layout but I am thinking West has a higher ratio than the likes of China Eastern Block

1) West roughly 1 per Platoon & handled fine by game as in Company formations.

2)Eastern Block tends to be in Support Company (Heavy Weapons whatever) so if present assume normal use 1 Support Comp to 3 Inf Comp
So 1 ATGM per Inf Comp or am I being thick?

3) We are talking alloted usage here fully realise if think a tank threat likely in area one would hope they assign more there by stripping other units.
To that end is there a HQ formation that can be assigned for such a purpose.

4) Also do infantry & armour formations have same allotment of or does one recieve more. Realise they can switch companies to form combat groups not talking about that.

5) Also vehicular ATGMs again can find very little info how are they alloted
From what can tell without going into specifics for certain dates.
Eastern Block assigns to Inf formations at 1 Comp per Regiment plus has a few dedicated tank killer regiments composed purely of. Does not give to tank Regiments though obviosly whole or part of tank killer could be assigned to

6) USMC Tend to have more TOW HMMWV than tanks 3:2 ratio?
7) What about the rest & Eastern theatre, likes of dessert storm did ATGM vehicles work with tanks or seperatly.

Hope this makes some sort of sense & don't take what I have said as correct, tis why this is out there to get a feel for the presence of ATGMs as had a big effect on the battlefield.
Any handy links welcome
thanks John