Right now mortars are mostly effective when used nearby a HAB/fob with an ammo crate. This is fine, but the mortar is really meant to be a dynamic artillery piece that can be transported by infantry across extremely rough terrain with ammo as well.

I mean whatever if the way mortars work settles into the current game balance of mortars mostly being used in static HAB positions.. that is fine but also I think something that might make gameplay more dynamic and make the coordinated use of smaller temporary artillery barrages in coordination with assaults on positions is to somehow implement the concept of squad mates being able to carry mortar ammo for you.

I think a practical way this could be implemented is the mortar operator kit is given a tool they can build an "ammo cache" with, but it requires another squadmate to be next to them (doesn't have to be squad leader). This ammo will refill the mortar operators ammo once. This can only be built with any particular squad member once per that squad members life (i.e. they have to die or be rearmed by an ammo crate to be able to help build an ammo cache with the mortar operator again).

This might make taking up a forward aggressive mortar position to temporarily bombard an enemy position from an unexpected direction much more possible and MORE IMPORTANTLY I think it would make moving into a position and neutralizes/subduing an enemy HAB much easier to do so that the addition of artillery doesn't purely benefit static well defended positions but destabilizes them in net effect.