Don’t know why it isn’t already in the game, but squad loadouts, with in-depth loadout changing for each soldier, There will be soldier loadouts for each soldiers combined into a squad loadout, each squad will have 3 loadouts. And for no bugs, just make it require the exact weapons/vehicles/equipment/soldier classes, if you have multiple ranked weapons/soldiers, it will ask you which rank you want to put in the loadout. You can also enable a option that it will put the highest ranked stuff in it without needing to ask you.
You will need to update the loadout if you add more slots. Or it will just add a trooper.