I would love to see us have the ability to take items from a base’s stores while a base defense is going on. If the rockets and ammo clips and grenades and rifles are already there, then picking them up should be easy. Going to the armory wing of the base would be one way to do this, but you might also have “weapon lockers” scattered around that allow soldiers to take needed ammo and grenades and such from almost anywhere in the base.
If you do make lockers, then to prevent them being destroyed or used as cover, have them hidden deep in the walls and come out on rails when a soldier activates a button. This essentially makes an ammo crate to take stuff from.