Let the Supply Drop resupply not just ammo but medical supplies as well. This gives it a great utility as sometimes meds are far more important than ammo
Change the icon of the Supply Drop on the map to differentiate it from regular ammo boxes
Separate the Supply Drop from Ammo Boxes. Ammo boxes and supply drops take up each other’s slots. For example if you’ve built 3 ammo boxes calling in a supply drop destroys a box and vice versa calling in supply drops and building a box destroys the supply. Separate them like how Rally Points and Mobile Rally Points are distinct and independent. Ammo Boxes and Supply Drops have separate utilities and roles on the battlefield