I bought a computer game recently that portrays the "Cold War Gone Hot" scenario from around 1979-82 or something like that (i.e. a bit earlier than 2000). However, I doubt much would have changed in terms of infantry squad structure in those 10 years. I examined the various infantry squads of each side to see if it would help with coming up with realistic enemy encounters etc. I won't go into detail ad nauseum but will focus on my general findings.
Squads normally consist of two fireteams. Often the squad contains an odd number of men, so effectively two equal sized fireteams of 3 or 4 men, plus a squad leader.
The first fireteam often has the single LMG or GPMG. If the squad has two of them, then of course these are split between the fireteams
The first fireteam usually also has the main AT weapon, if there is one. Often the second fireteam will have a lesser AT weapon such as a disposable rocket.
Virtually every man has some variation of equipment. Hardly any two soldiers are identical.
Example: Russian Rifle Squad...
Squad Leader: AK-74 assault rifle with GP-25 under-barrel grenade launcher
First Fireteam...
Machinegunner: RPK-74 Light machinegun
Launcher-crew: RPG-7V Anti-tank launcher plus AKS-74 assault rifle (folding stock version of AK-74)
Rifleman: AK-74 assault rifle
Second Fireteam...
Marksman: SVD "Dragunov" Sniper Rifle
Launcher-crew: AK-74 assault rifle plus RPG-18 disposable AT rocket (treat as LAW)
Rifleman: AK-74 assault rifle
So, for your encounters, remember to have a big variety of equipment rather than everyone all equipped much the same. The leaders and maybe some support weapon carriers might also have a pistol. Also remember grenades, including smoke grenades for leaders.