ArmA 2 modeling page is very much PMCTODO. Sorry.

Check Backpack for how to make custom backpack.

BIS has released sample model(s), it a soldier model + skeleton. Check out details here.

You can read still valid information about geometry from OFP: Modeling: Geometry LOD page.

Max poly count

ArmA soldier in-game for ArmA 2

How to swap into new Head proxy for your character models.

Check out info about how to create wreck model to vehicles.

If you get “old style material flags used” error, check old material used error page on how to fix it.

How to create wheel damage to your vehicle, read damaged wheels page.

Tutorial: modeling a tree by Mikebart

2nd UV set error explained.

How to make user animations.

Vehicle Shock Absorbers.