Firstly, I still think that all squad types should have at minimum 3 possible squads to obtain from the tech tree, to accommodate multiple presets (at least one available to use one in each of BR I-II, BR III, and BR IV-V). This could be achieved by tech tree additions or just a shop that allows you to purchase additional squads of that type for silver. Alternatively, change presets so that gear is updated too … allowing for one squad to automatically change gear within them using gear available on the account. This may need locking of gear from sale (You cannot sell this item because it is currently saved in a preset).
On to upgrade changes:
Mortars: there are two mortar upgrades in game, and one (IMO B, is far superior than the other). Also, side note: Japan and US really could use a 80mm+ mortar with armor penetration like that of the German and USSR tech trees.
A:
B:
Simply swapping the AT Gunner and Sniper (or assaulter) (B is my preferred upgrade) would make this so much better IMO and shouldn’t be so much of a change that it can’t be done.
Medics: not having an option to have an engineer is crippling to this squad, especially since the medic cannot use ammo bags and is replacing the assaulter I. Please add an engineer upgrade to these tech tree squads