First off is the tech tree I've been working on. Subformations such as Rifle, Engineers, Staff, Jeep, Truck, Tractor Trailer (instead of trains), Transport Ship and Fast Attack Craft will be "stone age", tech level 0 items. Then comes tech level 1 through 4 for all other subformations. There are basically two types of techs, differentiated only by the fact that one type of tech enables units and the other is sort of a general research item required to get to other tech levels. For example (shown on the chart), you must research "Heavy Weapons" before you are able to research "HMGs", "RR (recoilless rifles) and "Mortars". Or you can skip researching those items and go straight to "Heavy Artillery" or "Mechanized Heavy Weapons" after researching "Heavy Weapons".
