Multiple Deployment Sets: Before if you progressed to a higher rank in a campaign and started using squads that came with higher tier soldiers, your older squads pretty much became useless and collected dust even now after major update there’s a huge inventory of many squads you might not get to use at all. So instead of giving option to sell them why not make them more useful? By making it so that when all your squads die out in game you get to pick different squads from your inventory maybe even get to create different deployment sets(can have 2-3 sets or more if you buy premium membership?) which you can call up after your first deployment set dies that way your older squads wont be useless. So currently you get 4 squads available by default in your deployment sets, with this feature you would have 2-3 more deployment sets of 4 squads.
Making Reserves Useful: Can also make reserves more useful and can be actually used in battle where if your squad loses any men you can call up reserve soldiers(if that particular class is available in squad reserves) and they would spawn in from nearest spawn point and give your current squad last little longer in battle. Of course reserve call up would have limit so your not calling in infinite amount of reserves for just one squad. In your squad upgrades you can upgrade to have 1-2 reserve spots for every soldier in your squad which you get to choose from reserves who will be in that soldier’s reserve, so every squad can have 1-2 reserve spots for every soldier in squad and by default Riflemen would be available for any reserve spot if you don’t have that particular class in your reserve.